Hi Steven, I only had this piece and had to cut out the guts and cut it twice using the metal lathe (Hercus) and a turntable tool rest fitted with a Dremel and black cut off disk. I bought a 340,000 air driven handpiece recently 4 1/2 inches long takes 1.6 bits/ has ceramic dry bearings.Made in Japan, waiting on a free compressor etc from a dental tech firm. Next pen is a handpiece from a dentist modified. If you can get old dental handpieces they have lots of threaded parts etc. Pic shows the set up at the time cutting a circlip groove in Stainless Rod. Note the dremel fits neat into the extruded Aluminium piece, the extrusion is used by firms making truck swivels for tailgates.
Regards Peter.