Double threaded (two way) bolt and nut (screw)
thingiverse
This is a remix of "Two way screw by gvera" I remixed it because I wanted a longer bolt and a hexagonal base and nut. One of the nuts is lefty loosey, righty tighty and the other one is lefty tighty, righty loosey. It is quite fun to play with. If the fit is not perfect, you should scale the nut up or down depening on you issue. A few % up/down should be sufficient.
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