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[FreedomGun]

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[rmsg0040]

Looks like a roll pin, can be found at hardware store. Grind to length if too long.

 

[FreedomGun]

Looks like a roll pin, can be found at hardware store. Grind to length if too long.

Delete.

 

[Rman]

Roll pins come in different diameters, and their tension is based on that. Probably try a replacement pin of the same diameter first, and if it doesn't work, go up a size. Is that material plastic? It could be that the hole has become enlarged and now the pin is too small?
Amazon sells them... single or in packs.
R.