Originally Posted by
maddog34
if the shop/mechanic complains about, or refuses to put on parts you provide, find another shop. That amounts to being childish, and whining about them not getting to make more profit off of you.
Shops vary in their willingness to install customer provided parts, first because they don't make any money on the parts and second, if the provided parts don't fit properly or aren't compatible with the bike or don't work right afterward it can become contentious issue with the customer.