[ICON]

What i use when i have to pop pistons in the cylinder, and can't use a normal ring compressor, is a large hose clamp that'll fit around the piston. Just be careful that the clamp doesn't damage the jug when you're pushing the piston in. Have you measured end gaps on the rings to make sure they're the right size for the piston and cylinder? What happened to the piece that broke off, deffinately don't want that floating around in the bottom-end. What about seating the new rings into a cylinder that might've had the honing wore off already, i don't think they'll seat properly without another honing. Sounds like a clearance issue so measure the ring end-gap sitting in the bore and make sure it matches factory specs.