It would be dependant on how the rest of the stack was built. In a really soft stack it would be possible for that to happen. Also depends on the load, of course. Being that the 11 is .25mm thick is a lot better of course then having it be .1 thick. In all reality, I doubt it's hitting but I don't know how you have the rest of the stack built. In any case it's not something you would want to gamble with since if it did contact the base plate you would get an incredible increase in damping in a hurry. Great observation though russ17! Not too many people have a 10mm shim on hand, and I can assure you that 11 is plenty small enough for woods work if you get the rest of it right. Also, if you color the baseplate with a marker or some Dykem it will reveal if the 14 is indeed contacting the baseplate. Then you will have your answer and know if you should look elsewhere to solve your problem.