hi rita,
1.Do these handpieces fit onto that flexshaft?
yes, tho it will work with your cc it is nicer to have a machine
that has even torque at all speeds.
2.How do you know what rpm you're running (e.g., the #15
says not to exceed 5000rpm)
when it starts to have a life of its own, it is time to slow
down.
3.How does the darn thing work?
it slips onto the end of the sheath, just like any other
handpiece. it has a reciprocating tip that acts like a miniature
jackhammer best regards,
geo fox