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To hold the arms reasonably parallel I placed a length of timber ( about 25 x 150 x 500) through the handles and clamped it at top and bottom on each arm. If the bearings are machined concentric the arms should pretty well lie vertical. I ended up with the base of the fork arm parallel to the base drive unit....
AndrewJ-
With the 12" Lx200 I could get the necessary Dec rotation on the OTA (The safety stop limit the travel).................
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