Exactly, which is why I get pissed if I happen to supply the wrong part and cause a delay or problem in both his schedule and his business.

My mechanic generally charges a little extra if you bring your own parts since he doesn't warranty them and doesn't make anything for that side of the sale (he doesn't charge me the extra since we are friends).

As for a mechanic not taking parts in general, if my mechanic didn't I would find someone else. A good mechanic realizes that to maintain an older car an owner must be able to manage the costs involved. If you eliminate my ability to lower my costs with lower priced parts I will simply trash the car, buy a new one, and stop using his services. Ergo it makes sense to keep your customers in teh car you service if you plan on keeping them as customers.

-rt