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Mounting is easy Chris - use a standard Vixen/Synta/GSO finder bracket. Just ditch the Prostar/Northgroup thing.
I can definitely tune the GPD2. I tuned my GPD2 a few weeks back but yet to use it. I put the Tak FSQ-106Ed on it today to balance - quite an experience putting an all-up 9.3kg scope, guide setup and CCD on a 10kg limited mount. Took 4 counterweights on the standard bar. I ran Dec and RA for most of their travel, and no discernable ramp up lag nor any grind or bind.
Might be best to leave the GPD2 head with Allan and I can collect it soon. Or post it down - they are light enough. I have a tripod with pier I can fit it on to check etc.
I have not fiddled with an SS2K unit much (though have a complete SS2K here in a box!), so will have a good read of the instruction manual. One thing to note with the GPD2 is the propensity of the RA worm to loosen over time - more so than the Dec worm it seems. An easy way is to adjust it right and flow in some Loctite into the 3 screws (2x pull, 1 x push/tension). Also adjusting the RA rotational stiffness is vital - also makes balancing easier. A simple job.
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