[foxfish]

Originally Posted by settingsteel

Hiya Fox, don't know how far ahead you are but I rip a 1/8 slot up to the trig mech (or route) then use this

Core Box Router Bits - Toolstoday.com - Industrial Quality Carbide Tipped Router Bits
the second one (3/16) which permits a 9/32 or 5/16 shaft thus making an enclosed track

But that bit looks like it cuts a half circle not a full round?
I cant get my head around imperial measurements either - I want to fire a 6.35 or 6.5mm spear.
3/16 = 4.7mm
9/32 = 7.14
5/16 = 7.9mm