Ideas for a mech bottom fire without threading?

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GMayberry

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I am working on a tube-style mod, and have been tossing around ideas for a side fire button, but I am now shifting gears towards a bottom-fire. Does anyone have ideas of how I could design this without having any threads on the bottom? Going for a steampunk look, so pieces of the outside are ok. Please help with ideas!
 

asdaq

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I was trying to get the most length for the thinnest size. M3 or 4#40 is about the thinnest threaded rod I could find, over this fits 4mm OD 3mm ID tubing. You could try to get M2, but I found it too hard to source. If you do find some that actually is in stock, please let me know.

Two tubes with threading is enough for a stable mod, you could do 4 tubes and do something like this gorgeous USB drive:

awesome-steampunk-USB-drive_3.jpg
 
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