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16. Truly a skill to master, Marquez "rolls" each JE moly piston ring on without using any tools. He says that this method should be practiced first on some old pistons and rings, but when you get it right, there's no chance of spreading a ring too far and snapping it in two. There is, however, a greater chance of ruining the ring groove in the piston if you don't do this correctly, so be careful and practice first!