I have adjusted valve clearances on motorcycles and cars before. I have used the dealer and I have ground the shims too. How have the Toyota dealers been to work with on swapping shims to get the ones you need? I had a valve job done and most of the valves are too close by 4 to 8 thousandths. Since I don't have the tool to hold the bucket down, I thought I would just measure them all, pull the cams out, reuse the shims I can and swap for the ones I need. It is Sunday, otherwise I would have called the dealer.