SAB (Still Air Box) threaded arm hole
thingiverse
This can be used to close off the arm holes of a SAB (still air box). + The arm hole itself is 155mm (around 6") which should leave enough room to eliminate any piston effect. + The cap has a small indent inside so perhaps some caulk can be applied to it to have a good seal when closed but is really not needed + The fastener is not required if glue or caulk is used to keep the base in place but irregardless it makes things easier to install. Perhaps a single one can be printed to just help keep it in place untill the glue dries. + A template object is provided to mark the hole that needs to be cut out.
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