Does anyone have the Yamaha part numbers for the thinner shims? I believe that the stock ones are P/N 90384-16251-00 and are 15mm. I have read that other sleds use 7mm or 2.5mm shims. I want more weight transfer without the cost of adjustable transfer rods. What do you guys suggest? How hard are these shims to replace and can they be done on the machine? It looks like you could disconnect from the slide rails and then remove the bottom of the transfer rod. Is this correct?