Thanks John, I will install rubber today, also grab a bit bigger pulley, thanks for your feedback.The rubber under the t-80 is a shock absorber ,same as the feet on a engine base to protect the bearings. I'll measure my parts to see if pulley on pump too smallMFG are leaving them off to ruin your engnes/pumps faster same a HUGE holes in footvalves so you suck up rocks and gring them impeller/pump seal bearings right up also----Looks right by eye but the micrometer tells the truth-John