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Hello,
There is an alternative belt length that could be used without the 2 rollers but the position of the motors are fully at the end of the adjustment slots to get the belt to tension.
This means the RA motor will hit the declination shaft and would require a bit filing off the aluminium motor end plate to clear. There isn't a 'perfect' length belt available.
With the rollers in the belt path, final tension is achieved with the motor in the centre of its adjustment and not interfering with any other parts.
The rollers also makes the belt wrap further around the small 9 tooh pulley which engages more teeth with the belt and both belts are now the same length.
Cheers, Dave.
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