Anastasia, Most likely when you purchased your flex shaft, it came
with directions on how to care for your machine, maybe you shoud try
calling the company and get another booklet on how to care for your
As far as your problem (# 30 handpiece has ““never really”” run
true) this is a fine time to be thinking about that, you should have
done something when you first noticed the problem, not when you think
its past the warranty period.
When anyone purchases a piece of equipment and it comes with some
type of instructions for care and maintenance, I believe the reason
that it was included in the package in the first place was so that
you would read it and save it for future reference.
Have a pleasant day!
Sincerely, Richard Lucas