ziggy, the shaft is 55mm. He used a piece of pvc pipe to shim it to the mount.

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Icon 550, on .90M primestar DG380 motor.10'Sami+GI650 for c-band.
Merc2 now on 1m primestar-polar mount backup system.
*New Avatar-Sign of Spring-Possums return from Capistrano.