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Repair Seized Center Focus Mechanism on Miniature Binoculars 2. Mechanismus für die Fokussierung 2. Rèparer le Mécanisme de Mise au Point Cnetral Saisi sur des Jumelles Miniatures 2. Reparera de Centrala Fokus Kikare: fri Beslag Ocular 2. La Reparación de un Mecanismo de Enfoque Centro Incautadas en Miniatura Prismáticos 2. Ripare il Meccanisimo di Messa a Fuoco Centrato sul Binocolo in Miniatura 2.

The symptom of this problem is that the center focus wheel is impossible to turn, or is very hard to turn. This repair is based on heating the solidified optical grease that has seized the mechanism.

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Das Symptom dieses Problems ist, dass sich das zentrale Fokusrad nicht drehen lässt oder sich nur schwer drehen lässt. Diese Reparatur basiert auf der Erwärmung des erstarrten optischen Schmierfetts, das den Mechanismus ergriffen hat.Le symptôme de ce problème est que la roue de mise au point centrale est impossible à tourner, ou est très difficile à tourner. Cette réparation est basée sur le chauffage de la graisse optique solidifiée qui a saisi le mécanisme. この問題の症状は、中央のフォーカスホイールが回転できないか、回転しにくいことです。この補修は、機構を握った固化した光学グリースを加熱することに基づいている。 Симптом этой проблемы заключается в том, что колесо с центральным фокусом невозможно поворачивать или очень трудно поворачивать. Этот ремонт основан на нагревании затвердевшей оптической смазки, которая захватила механизм. Symptomen på detta problem är att centrumfokushjulet är omöjligt att vända, eller är mycket svårt att vända. Denna reparation baseras på uppvärmning av det stelnade optiska fettet som har gripit in mekanismen.El síntoma de este problema es que la rueda de enfoque central es imposible de girar, o es muy difícil de girar. Esta reparación se basa en calentar la grasa óptica solidificada que se ha apoderado del mecanismo.Il sintomo di questo problema è che la ruota di messa a fuoco centrale è impossibile girare o è molto difficile ruotare. Questa riparazione si basa sul riscaldamento del grasso ottico solidificato che ha bloccato il meccanismo.

On these Petlux Shannon 10x30 binoculars which have an ocular based central focus mechanism, the screw mechanism is located under the cap of the central pivot on the objective end of the hinge as shown in the picture on the left.

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While these particular binoculars have a screw, notice that it is below the part line of the cap and as a result the screw DOES NOT secure the cap. On other similar binoculars there is a screw though the cap that does secure the cap against unscrewing the cap.

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In this instance the cap would not unscrew with my fingers. So to get better access to the cap I removed both objective barrels, which did unscrew without a tool. If they don’t, use a rubber strap wrench

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Removing the objective barrels made it easy to use a small rubber strap wrench to unscrew the pivot cap.

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Heat the seized mechanism to soften the hardened optical grease (often gray in color). In this case it was frozen in a retracted position. Heat until the focus wheel turns by hand.

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When the focus wheel turns extend the screw mechanism and heat some more. Then work the mechanism in and out to free it up, reheating if necessary. 9It may tend to solidify as it cools). In this case working the mechanism in and out was sufficient to free it up. If it remains hard to operate then extend the screw, brush with a small wire brush and lube with      fresh optical or silicone grease.

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Once the focus mechanism is operating freely but with some resistance, reassemble the binoculars.

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Repair a Loose Center Pivot or Hinge on Miniature Binoculars. Repariere einen lockeren Drehpunkt oder ein Scharnier an Miniaturferngläsern. Réparer un Pivot Central Lâche ou une Charnière sur des Jumelles Miniatures. ミニチュア双眼鏡でルーズセンターピボットまたは ヒンジ を修復する. Reparera ett Löst Centrum Sväng Eller Hängsel på Minikikare. Repare un Pivote de Centro Fojo o una Bisagra en Prismáticos Miniatura. Riparare un Perno Centrale o Cerniera Allentato sul Binocolo in Miniature.

The symptom of this problem is that the two halves of the binocular flop open and shut and won’t remain adjusted for the distance between your eyes because the center pivot or hinge does not have enough friction. There are a a number ofvariations on exactly what tensions the pivot and how it does it depending on binoculars configuration.

Center Focus Where Oculars Move in and Out. Focus Wheel on Ocular Side .

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On these 10x30 binoculars which have an ocular based central focus mechanism, the screw mechanism is located under the cap of the central pivot on the objective end of the hinge or pivot as shown in the picture on the left.

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While these particular binoculars have a screw, notice that it is below the part line of the cap and as a result the screw DOES NOT secure the cap. On other similar binoculars there is a screw though the cap that does secure the cap against unscrewing the cap. On others there is no screw either part.

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Sometimes the cap will simply screw off counter clockwise with your fingers, as near right. A trick that might work, as it is hard to get a good grip, is to wrap a rubber band around the cap as shown middle right. It might be possible to do that and use small pliers but I do not recommend it as the probability of a good outcome without damage is not great. It is better to get better access to the cap by removeing both objective barrels as shown far right, which did unscrew without a tool. If they don’t, use a rubber strap wrench

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Removing the objective barrels made it easy to use a small rubber strap wrench to unscrew the pivot cap. You will typically see a brass ring as shown far right on a Tasco Model 502

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Check that the ring does not have a set screw anywhere that would need to be loosened to move the ring. The Tasco 502 pictured at right didn’t have one. You can then use a small screwdriver or a pointed screw and small hammer to walk the retaining ring by one of it’s tensioning holes to create more friction on the pivot. When satisfied, reassemble.

Tighten Pivot on Typical Independent Focus Miniature Binoculars

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Remove the screw on the objective side of the pivot. ***NOTE***these screws are usually REVERSE THREAD and they UNSCREW CLOCKWISE! Also you often need a fairly wide but thinner than normal screwdriver to break these free.

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You will see a retaining collar around a central shaft internally and externally threaded. This Collar is what tensions the pivot or hinge. These are usually a normal thread and they tighten clockwise. Use a small screwdriver or piece of heavy wire or punch or nail and engage a hole and walk the collar by tapping your tool with a small hammer to the desired pivot tension.

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Reassemble

Center Focus Where Oculars Move in and Out. Focus Wheel on Ocular Side .

Center Focus Where Objectives Move in and Out. Focus Wheel on Objective Side .

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