I'm replacing the right side axle trumpet on my 9N. The old gasket between the trumpet and the differential housing measures 0.014" thick. It's in good shape and I could either use it again or use new gaskets, which are 0.008" thick, so 2 would stack to 0.016" and I presume squish down a bit. I can't figure any way to measure the amount of preload on the bearing. What's the normal procedure?