12 gauge cartridge opener
thingiverse
This tool is designed to open 12-gauge cartridges so that the shot can be extracted and a slug inserted. Insert a 9mm cutter blade into the groove. Use an M6 x 30 CHC bolt and a nylstop nut. Insert an M4 nut and an M4 screw to lock the blade. Print the parts without support. How to use: Open the tool, put a cartridge inside. Close the tool, and turn the shell clockwise one-third of a turn, then counterclockwise two-thirds of a turn. Then you can turn the shell completely. Do not try to turn only in one way, or the tool will malfunction.
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