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Bumper Assembly Question


DGinGA
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The hammer spring guide broke off the knurled knob which screws into the receiver (referred to as the bumper on schematics). I have a replacement knob and guide - but its not the same. The spring guide is hollow, whereas the old one was solid. It has a flange which is smaller than the matching hole in the knob front. My question: how is this assembled? Is there another style of this item? Why are the new guides hollow? Im tempted to just lathe a guide to fit, as it doesnt seem very precise. Any guidance is appreciated.
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It was redesigned to prevent breakage - the side with the flange rests in the recess of the bumper plug and is held in place by spring tension. It is not a precision assembly; if there's a little slop in the fitment of the flange within the bumper plug, it should not affect function.

Edited by Republic
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Get yourself a copy of Frank Iannamico's book. Along with a myriad of other info it gives the design history of the Reising. Bumper plugs and guides are covered in pages 53-55. The guide HAS to fit somewhat loosely in the plug for it to work properly. A tight-fitting plug may not be concentric enough to the receiver to prevent damage to the hammer spring; a loose-fitting guide will self-align

 

https://www.smallarmsreview.com/inventory/detail.item.cfm?product_id=31

Edited by StrangeRanger
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Be aware there is several types of bumper plugs . There was a few models of the one piece style as they tried cylindrical , tapered , and hollow styles to overcome the breakage problem . None of these really worked as the stem could not be made to completely align with the receiver bore . The first style two piece helped a lot , but still had problems . The final style had the rod knob fitted loose in the hole and set into the hole a wee bit so as the first coil of the hammer spring would fit into the hole . This final type is what you want to use . It allows movement to allow the hammer spring to exert even , equal pressure upon the stem and keep it centered.

Chris

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