I made one by grinding a large cut off hardened bolt useing a 14 mm allen wrench as a guide I ground it with an angle grinder till I had a snug fit ,it also works for the plugs in the differenials of my 126's.I think I used a 3/4 inch hardened bolt cut it to about an inch in length and the used a 3/4 inch box end wrench to loosen the plugs, they were quiet tight but the big wrench made it easy. I traded one to a local lube place for a diff. flush and refill. If you have and angle grinder use a new wheel(as they gring flater) it only takes ten or so minutes to make one............
William rogers........