Vintage Synth Repair

Has anybody out there serviced on of these?

I've got an Eminent Solina, (Which I think Arp bought off them and Sold 
as the Arp Solina) and it works lovely, I would just love to be able to 
fix up the 'clacky' key action.. 

I can't seem to find any info on what bushings they use.. ultimately, I 
could open it up, but if someone out there knows what type of bushings 
or if it uses "Pratt Reed" bushings etc, that would be very good to 
know.

Regards
Mike