Quote Originally Posted by Rob M View Post
I'm thinking about tuning my old Vulcan (when I get time... ), I've got the delrin to button the piston, will try to get a posh piston head of some sort maybe, and have thought about putting a small radius on the transfer port using some sort of tapered tool and valve grinding paste. I've got a lathe, but as you say, working at length down the cylinder is likely to cause issues with chatter or vibration.

One day maybe...
Your Vulcan requires the Chambers purple washer and a reasonable top hat. Use a std Webley spring, not a Titan jobby and machine up a better fitting guide rod