Use c-clamps or vise grips for the clutch springs, work your way around and use a clamp to hold the spring in the slot while you get the last part over those little metal tabs. Put the rings in the cylinder, slide them down with the piston about an inch, measure the gap with a feeler gauge if the gap is too small you'll need to file the end a little bit. Now carefully instal the rings onto the piston (make sure the ends are right side up, and if you have two different rings make sure to put them in the right place). They will open up just enough to fit, but too much will snap them. When you install the piston align the ring ends with the pins in the ring groove and compress the rings with your thumb and index finger on the side of the piston where the transfers are, then slide the cylinder down with the other hand. Go slow, if it doesn't fit you're doing something wrong so try again.