In message <4.1.19990803155318.00996700@traverse.com> Kneale Brownson writes: > I had a Mercedes 230SL that had a quarter million miles on it when it left > my ownership, and it had three spark plug holes heli'd for the 120K miles I > drove it. A properly done Helicoil is stronger than the original thread. Simple physics. -- Phil Payne UK Audi quattro Owners Club Phone: 0385 302803 Fax: 0870 0883933