Thanks Peter and Merlin (Peter PM sent)
Since writing my first post I have just worked out that I don't have the required minimum 20mm focus travel on my SW focuser once my imaging rig is in focus (camera + powermate). I have about 15 mm travel left . So it looks like I won't be able to use a filter wheel after all.
I suppose I would have the same problem with a drawer system, wouldn't I?
Cheers,
Eric
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