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How about a new cheap variable speed drill? They're pretty cheap and readily available at Harbor Freight (no affiliation). That would probably be fairly versatile with either a 3/8" or a 1/2" chuck. Some drills are still variable with the trigger locked. You might even own a drill already too...

Whoops should've took the dust off of the graphite.

I originally had the displacer bushing in brass, then two graphite bushings. Again second one on the motor. It machines super easy and takes very fine details! The threads came out just as nice as the brass one! Solid, just like a pencil lead!

The wrist pin "U" channel is screwed through the piston dome. Was actually easy to do from my phone! Jim

Second pic!

My 2 pistons were both very dense with no voids. The first one was EDM graphite, & I thought that might be a little to hard. So I got regular graphite rod, & to tell you the truth, they seem close enough to be the same. The second piston is in it now. Two pics of the original if this works from...

The cylinder should also be very accurately parallel with very little bell mouthing on either end! My Stirling can get very hot after running for 6 to 8 hours, years ago when I first made it after it got hot it would run slower & more finicky, I even at times had to let it cool down a bit. This...

The Graphite works amazingly well on these relatively low power motors. I really doubt you would get similar results using graphite as a lubricating medium! You should first concentrate on getting the cylinder polished up as high as you can get it. I used a bronze cylinder in mine with a mirror...