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I've had a bit of a think about your alt disks. You've only got a couple of screws holding them in place. With the load they are supporting the will always flex out. Look to strengthen the coupling mechanism to the tube rings as that is the weak spot. That's the reason why I prefer the more cumbersome looking box-cradle around the tube that holds the alt disks - no flex then.
Maybe if you fashion a plywood arc to act as a third tube ring that only reaches over the top of the scope to give you a third point along the top of the disks, this will stop the flex.
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