Thanks for the quick replies guys.
Paul, I checked an old sledge hammer head in the shed - 28mm wide hole - oh well - good idea though. I'll see if a local shop will drill out my weights when they're open again. Any suggestion on what size hole I should ask for - I was thinking 33mm?
I picked up a used CW bar/plate for my alt/az DM6 mount (same as losmandy shaft) on the last US trip - since it's horizontal I don't need to worry about the weights moving.
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