Since they make beer and soda cans out of such thin aluminum these days, you can cut a square out of the can with shears and rap around the shaft to protect the seal. You can dress the exposed edge of the can with a fine file to remove the roughness. Also the manual says to remove the tandem pump bracket to change the pump. Those allen bolts are a PITA. A fellow mechanic enlightened me to the fact that if you remove the tensioner, the job is a piece of cake.

Peter

__________________
Auto Zentral Ltd.