I want to thank everyone for their help. I could not find a strap wrench, so ended up making one. I thought I would pass on how I made the wrench in hopes it may help someone else. (I also stuck about 3' of nylon rope into the piston chamber, just to be on the safe side).
This is how I made my strap wrench. I took a 42" piece of 1-1/2" inch wide nylon strap (almost too short-48" would be better), looped each end, and stuck the ends through the slot of a 1/2" socket that has a slot cut out of the side to remove temperature sensors on heavy equipment. My socket is 7/8" so enough room for the nylon loops, but I think an auto oxygen sensor socket would also work-it is made the same concerning the slot. Usually you can borrow an oxygen sensor socket from the major auto parts stores at no charge, so it is worth a try. When I stuck the folded ends of the nylon strap through the slots, I stuck a bolt in the fold of the nylon, so the ends would not pull out, but do not know if that really helped. A regular oxygen sensor socket may not have enough room. Anyway, with the strap wrench and rope-in-the-piston-chamber, it broke loose with little effort. Again, I thank everyone for their help.