I found this guy on Stovebolt through Grigg. For anyone needing stainless steel sleeves in their wheel cylinders, I just spoke with Mark, and his local phone number has changed as of 6/3/08. Below are the updated phone numbers:
The guy to have stainless sleeve your cylinders is:
Mark "the machinist" Frappier
82 Mountianview St.
Agawam, MA 01001
413-789-8665, or 800-528-5235