Just as an update from a very old thread now, I'd like to add that since doing my own penetration adjustments to the claw mechanism when changing out the main motor on the Beaulieu Stereo quite recently, no more noise is now generated from the projector gate by running acetate prints now, than even with my finest running Polyester prints.
When I first wrote the above information, my projector had been serviced but still did not come back sounding like it does now. Subsequently, what I can now add to give assurance to Vidar, and others in their possible future pursuits, is these can,and should, sound and run ANY print perfectly quietly and with great image stability.
No projector can beat a Bauer T610 for running noise, but these models, when set to their optimum position, just purr and sound terrific throughout and now much much quieter than any ST1200 I have owned, opposite to what I had originally concluded here with acetate prints.
Again, just for clarification here, the following specifications have been found from the old Super 8 database regarding weights of the big three:-
1/ GS 1200 Xenon - 16.5kg (Bloody Heavy!)
2/ Fumeo 9119 / 20 - 14.8KG (Very large & Heavy Duty Motor)
3/ Elmo GS 1200 - 14kg
4/ Beaulieu 708EL CD Stereo - 12.6KG