I'm having trouble getting my shims to fit back in on my axles that I bought from carquest. It appears that they are radius cut and the shims do not slide onto the axle facing and lay flat. Is there anything wrong with me taking the shims to a machine shop and have them carve out the very edge of the inside diameter? I also need shims that are smaller than what the Mercedes dealership offers. The minimum size they can give me is 1 mm but I need less than that, around 0.80. Can a machine shop fix this too?