Take a stand off, at least one inch long, and grind it until it fits into the end of the air cylinder (we have a little milling machine, but the prototype was made by grinding) then secure this new pivot into your structure with a couple shoulder screws from robosource.net.
Just a quick question.
Are you able to rotate the piston and then secure it at the desirable location? Or is it supposed to be in the desired direction during construction?
Instead of grinding down a standoff, you can just put a spacer on the screw going through the cylinder’s mounting hole and insert a screw into the gap instead