I've measured the outside diameter to be exactly 56mm (or slightly smaller), when I tried to measure in "inch", it gives a non-integer value.

And for the 57mm thread, it's 4mm long. No need to make a stop for the thread as we can see from the Borg's side, it actually has a stop there.

The original SCT adapter of the NGF-S focuser for reference:-

No need to make that long 50mm tube as found in the original SCT adapter for it's useless.
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