If your mount is the older EQ6 or the newer NEQ6 not the EQ6-R ( 2017 - present ) then it’s purely gear / worm driven. Only the EQ6-R has belts between the motor and worm gear
There was a guy located in Perth on our forum back in 2017 named “Jimmy” who set up a little business repairing and tuning EQ5 , HEQ5 and EQ6 mounts. I don’t know if he is still doing the work , maybe send him a PM
Other than that most folk do there own Skywatcher EQ5,HEQ5, EQ6 and EQ6-R mount repairs and tuning if they are out of warranty.
Below is a link to Astrobaby which shows you how to pull apart an EQ6 mount , repair / replace parts and tune etc...
https://www.astro-baby.com/astrobaby...n-atlas-mount/
Hopefully someone on IIS might know a repairer in QLD
Sorry can’t provide any further help
Good luck with it