reallylongnickname said: I thought I understood, but I don't. Since the feeler gauge is at that end of shaft, this would mean A rises. However, the Q is asking about be. So in this case, B would go lower, therefore B should be a negative shouldn't it??? View attachment 44612 Click to expand... Putting the shim at B rather than A would result in the opposite sign for t. What sign corresponds to which position is a sign convention that we are not privy to, I'm afraid.