Source For Bp Handwheel For Fine Quill Movement

I would like to have one every once and a while for my Supermax, the Singer sounds good too.
 
Can anyone provide the measurement (edge to edge) from the 1/2" bore to the pin, and the diameter of the pin?
 
Can anyone provide the measurement (edge to edge) from the 1/2" bore to the pin, and the diameter of the pin?

Mine measures 0.5235 center of bore to center of pin. Pin is .125 diameter.

Ted
 
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