I do most of the work to my own cars, but occationally I will bring my cars to the shop with the part. It is important to have a good relationship with the shop. As a business owner I know the importance of being able to mark up materials. I always agree to a special labor rate which is higher than the normal. It's best to trust the shop because I leave them with no responsibility. Misdiagnosis, my problem, bad part, my problem, misinstallation, my problem again. You've goto trust who you're dealing with and they have to trust you. Business is business. Sean Duggan Los Angeles