2 stroke single cylinder with handle

simple 2 stroke single cylinder, this has a handle on the back which you can wind to make the piston go up and down, 

I purchased a small 5v 10rpm motor and added it to the back of mine for a constant moving piston when my pc is powered on, as you can see, it isnt pretty from behind but it works.

I suggest you find your own motor as the one i purchased was a little big so this is still a work in progress. i shall update this if i find one that fits better. i recommend under 15rpm otherwise its just going to be noisey. you will need to edit crankshaft part 1 to fit your motor of choice.