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Hi Keith,

if my calculations were correct, 3 3/4 inches is 9.525 cm, and 1 1/4 inches is 3.175 cm.
So I rounded it accordingly to 10cm and 3cm.

If this is correct, then I'm happy to announce that the spool holder handle, which fits your spools, is uploaded!

Please report if it suits your needs and please share your results with hitting the "Post a make" button.

Best wishes,