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Hi Bill
Not sure if this is what you mean but I used an 8" square piece of plate steel, 1/2" thick. I drilled a 1/2" hole in the centre and welded a 1/2" bolt facing up to mount a Losmandy MA. Around the outside edge of the plate I drilled 4 x 7/16 holes to carry the levelling rods, I placed a nut and flat washer underneath and placed a flatwasher, spring washer and nut on top. This gave me plenty of adjustment.
Photo below shows the final setup, 230mm dia thick walled PVC sewer pipe filled with cement and the threaded levelling rods inside, the adjusting plate fitted with the Losmandy MA and the 12" Losmandy extension on top of that, the G-11 is mounted and there is plenty of clearance.
Hope that helps a little.
Cheers
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