Quote Originally Posted by TenMetrePeter View Post
I use M3 x 4mm stainless button head hex socket screw from e8ay.
Someone on that site is selling them as an air arms spare for nearly 4 quid each but that should get you a pack of 5. The black M3x5 ones should be ok as the hole is pretty deep.
Gents, the plan is to fit a 3x1 O ring to the M3x5 button head which will reduce it's penetration into the hole a tad and also give a nice airtight seal. Will let you know how well it works