Fitting New EQ6 Counterweight Extension Shaft to Older EQ6?

[dave_tucker]

As my EQ6 lies in bits while I rebuild it, I've been considering what other "upgrades" I can do...
I noticed that the counterweight shaft has an M6 thread won't accept the extension bar from FLO
https://www.firstlightoptics.com/sky-watcher-mount-accessories/counterweight-bar-extension-for-skywatcher-neq6.html

The battery on my calipers has died, but eyeballing it the OD appears to be close to 18mm, which is identical to the extension bar.
I know that a thread adapter might work, but a more elegant solution would be for someone with a lathe to bore out a larger hole and tap it with M12 thread.

I'm curious if anyone has had this done?
Or if there is anyone with a lathe that might be willing to do it - ideally within driving distance so I don't have to pay postage
 

Edited March 10, 2021 by dave_tucker