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Phil,
Take the housing OFF. It's only one screw.
The focuser mechanism is on the other side, and on these, it's quite a technical masterpiece - not sure if they continued it, but the FCT's have a tensioner plate (chromed) on TOP of the pinion casting to make sure the pressure is equal. I know the FSQ-106N does NOT have it, so perhaps the newer versions don't.
BUT, absolutely REMOVE the cast cover.
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