Hi all - does anyone happen to know the diameter of the stainless steel roll pin that holds the spinnaker pole end piston in place - this is for the original 3" aluminum OD pole? Somehow that piston got loose and the piston spring, well, sprung out when the roll pin fell out. My friend fabricated a new spring for me and I was able to find a suitable-ish replacement pin, but they aren't stainless and they are already starting to corrode badly. Thanks for the help.