Valve Seals / Air Chuck

Ditto on what 69DartGT said. I just brazed an air line fitting to an old spark plug with the ceramic knocked off, and it works like a charm. I've been using this same fitting for about 25 years now and it's never failed me. You don't have to worry about finding TDC with this, believe me - everything arranges itself when you hook up the air line. :) I just leave the regulator set to wherever it is at the time, usually around 100 PSI.

Sid
http://www.cardomain.com/ride/2115668