The best way to remove the flywheels is to use channel locks to hold the flywheel itself. The colllets hold it tight enough to allow you to loosen the flywheel. I never did like the piston locks.

Another way I do it sometimes, is I take out the backplate and I stick a screwdriver on the crankshaft and I turn it, the bottom of the conrod locks the screwdriver and out comes the flywheel. I dont like this method either but sometimes its the only way. Its a lot cheaper to replace a conrod than a piston and sleeve.