Brownells part # 080-685-130WB
#5 - 3.5MM (0.138") ROLL PIN HOLDER
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As luck would have it I discovered this 3.5 mm roll pin holder works great for installing extractor springs. Just cut a small piece off of a 3.5mm o'ring, enough to fill the hole about 1/2 way on the punch.
The tool holds the extractor spring just right and prevents over compression and deformation of the spring while snapping it into the extractor.
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