Before taking a scope apart to do modifications to it, I would first install a premium micro focuser to reduce any play there, can't hurt and may be all that is needed!
A) I already have a premium micro focuser.
No matter what kind of focuser you have, it drives the same screw so it doesn't matter what kind of focuser you have. This issue is strictly related to the way the mirror is mounted.
C) I want to take the scope apart for some other reasons in a month or so anyway and this is a nice mod to do at the same time. I spent over 25 years professionally designing, building, and aligning optical-mechanical instrumentation much more complicated than a C14 so this job doesn't scare me. Do I know what I'm doing? Yes. Could I screw it up? Absolutely. But, I'm an engineer and engineers by nature have to take stuff apart and (at least attempt) to put it back together.
Stay tuned. I'll let you know how it goes…