Piston in an engine is in the first class of lever.

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piston are all ready on the new minecraft beta and they will mot be removed.

Yep!

Place rings into their respective positions on the piston. Place ring compressor over rings and tighten up until you can only just move the piston inside the compressor. Place the top of the piston into the bottom of the cylinder, push the piston and rings up out out of the compressor and into the cylinder keeping the compressor hard against the base of the cylinder. If you do not hold the compressor hard against cylinder the rings will slip out and you start again, you are not allowed to throw the compressor at your garage door until the third time. You should try it without a compressor, or have you?.