Originally Posted by Brian.Samson
Conor's come up with a cool idea, if I can find the fittings or get some made up to order it'll work even better.
I reckoned on about 11.5 - 12mm for the exposed thread length. 12 would probably be better, the knob doesn't have to butt up completely flush with the stock body after all.
Same thread used on my LG100 to secure the rear stock to the chassis. Might need to be longer. Will have to measure. I will take 3! :-)