Suggestion? You can lose the lens gear retaining clips if you simply fit slightly-oversizewashers on top of the idler gears on the rim. Indeed if you put washers on the underside of the idler gears too that should lift the lens gears off the metal of the frames and so vastly reduce the friction between the lens gears and the frame itself.
If you want I can draw you a diagram -- I am not going to attempt to do it in ASCII.
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If you want I can draw you a diagram -- I am not going to attempt to do it in ASCII.