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Hi Raymo,
Yes it's a Crayford style.
When the focuser is fully screwed in the motor actually stalls and doesn't spin. I can manually turn the fine focus knob on the other side and help it along, but I can definitely feel some resistance there. Once it gets past the 2-3mm zone of resistance in the travel it frees up again and the motor works under it's own power.
Possibly the bearings under the drawtube? When I take the focuser off though the drawtube slides very easily, so that leads me to think it's not that.....
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