Don a free organizer for pistons & rod assemblies that is 100% will not damage is the 8 pack crates used to 2LT pop bottles.Around here you can go to your local grocery store and ask them for one.Most of the time when you tell them what you want to use it for,they will give you one.I number on the side of it the cylinder that piston/rod goes into just like it would be on the engine.