For the emitter end, I toyed with a knob that I had picked up for a dollar at Ocean State Job Lot. but it really didn't seem to be the solution. So I had some old hard drive bits from drives that I have taken apart. (for security reasons....)
using a drift and a hammer, the drive parts come apart. They're only press fit.
I did sand down the drive motor so it would fit in the same spot as the old lens. Thank goodness for a belt sander!