The easy way to have a quick fix is file the bottom end of the bolt in narrow angle possible 15/20 degree, way up to the bottom of push pin, this spacing could allow the hammer strike straight on the end of push pin without being forend pull back that 2-3mm to block or disturb the hammer strike.
BUT, the trade off could be reduce the power of the shot out since the shell could have been pull back 2mm and when the wad past through the edge and slow it down.
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aka Uncle
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