Thanks bap, you gonna stack some batts in there maybe?
Since you have the
threads in there, I suppose the locking ring comes next, with male
threads on a nipple and a center hole that the chicago screw assembly fits into? Or a GG style switch to just screw into that hole? That cap looks deep enough that a smooth bore hole would be good for the shaft, you could have just the chicago screw part and have a post and a hole that have to line up to fire. Fewer parts to make and it would be shorter.
Notice I didn't show the other end as the switch is somewhere around an inch long and needs shrinkage.
