Friday, August 13, 2010

BSF S20 WCM Pistol Disassembly, Part 2

On I go…

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That extremely annoying pin, which the trigger spring rests on, prevents removal of the cocking lever. It is peened on both sides.

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So I carefully filed one end until I could punch it out.

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I’m not sure why there’s a tapered flat on the pin, possibly to clear the cocking lever arm? Did I mention I hate that pin?

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The barrel assembly removed.

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The piston slid out easily.

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That is not the proper lubrication for a smoothly operating spring piston airgun.

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Piston seal removed.

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The seal is in great shape.

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Looks like they welded the end of the piston on and probably tempered it.

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As the other end of the piston sear is likewise oxidized and probably tempered.

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The end plug and spacer.

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The (for lack of a better word) transfer bar is retained by an extremely peened pin and I decided there was no need to remove it.

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There’s a dowel pin with a round nose that sticks out of the end plug. It sets the amount of sear engagement.

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It bears on the central part of the sear assembly.

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The pin stickout is controlled by a screw in the plug. The pin, logically, sticks out more with the screw screwed in…

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…and less with it screwed out.

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The conical tip of the screw moves the pin laterally.

Now to clean out all the old grease and reassemble.

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