Recently started fiddling with Victa PowerTorque Mowers. Special tools $87 each... no way. I bought a couple of large nuts from Bunnings and hack sawed and ground them out in a similar way as has been done with these sockets. Then bought 1/2" drive sockets for the nuts. Used a rattle gun for the first - no worries but after reading warnings on this forum I have found I can easily remove the crankpins with my 1/2" tension wrench. (tip is leave the engine in the chassis so you don't need to stop it moving.) I removed the head first and put a snug fitting piece of softwood in the bore with the head refitted to stop the engine turning.