It's for use with a long refractor (weighs about 5-6kg), so I don't want anything bumping the tripod.

It should be solid, the scope it will be used with is
It should have slow motion controls I think and also had sidereal motion, but don't need GOTO.
If I can attach an extension to it, it's of interest. An EQ5 is getting a bit heavy, but maybe would consider.
If you can pack it, I can pick it up (don't worry about freight, I have good logistics for pickup).
I'd even consider a nice AZ..
I'm located in Brisbane, but as said, if you've got what I need, I'll get it collected.