Kevin…I don’t have a direct answer to your question because I
have not had to have any repairs made to my RT for a number of years.
But, I have often taken the spindle out of my RT head, cleaned it
with alcohol and a rag and lubed it with some sewing machine oil.
Takes about 20 minutes and keeps it spinning. There are two little
set screws in the collar one on either side of the registration slot.
Loosen them and the spindle pulls right out. Be careful not to lose
the thin washers and that you put everything back exactly as you take
it apart.
Most likely the handpiece needs to be cleaned & oiled. There is a
small shaft collar at the bottom where you insert the dop. Use a
small allen wrench to loosen the set screws on the shaft collar.
Remove the shaft collar and plastic washer, then pull the assembly
out of the main body of the handpiece. Now clean the parts, oil with
sewing machine oil and reassemble.