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Hi Rob,
the cord is fixed to one side of the timber sector between the 2 aluminium ones under the dob base, then runs along its circumference, around the pulley/roller (seen on the motor assembly) and to the tensioner on the other side.
so it pulls around its circumference.
the base just rolls on 8 bearings seperate to the drive assembly.
I hope this makes sense...
Cheers
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