Hear me out 
I bought a 3d touch probe for my HDM and have it working with macros in gSender. But it needs a 6mm collet for the HDM ER20 spindle.
The probe has adjustment screws to dial the tip in perfectly concentric with the spindle, which I have done. But if it rotates in the collet (eg removing/re-installing) the tip can be off by up to .002". This is with a PwnCNC ER20 advertised as TIR of 0.0004" - which is probably about right as the probe tip is quite a long way from the collet so errors are exaggerated.
I know that .001-2" is probably at the limit of the probe and mill accuracy, but ya gotta start somewhere trying to remove sources of error.
I could spend more on even better collets - but if the probe were to stay indexed to the exact same orientation within a collet - then the collet accuracy shouldn’t matter at all as misalignment can all be dialed out.
Which leads me to: Is it a crazy idea to just loctite the probe into a collet (inserted into a spare dedicated nut).
Reasons I can think of not to do this is:
- I somehow glue the collet into my spindle. This would be bad. As long as I glue before inserting it should be okay.
- I ruin the shaft on the probe.
- The loctite wont hold anyways when I tighten/remove it from the spindle
Anything else I’m missing ?