Harris Milling Machine Arbour Adjustable spacing collar

[SteveIParticipant @stevei]

Hi,

I have been given a "Harris" milling machine arbour adjustable spacing collar. Picture here:

The collar is in 2 parts with a 20 TPI thread. The nut component has 50 teeth around its outside diameter. The screw part has 2 small tapped holes. Presumably for a ratchet to allow easy adjustment of the spacer by 1 tooth/thou, at a time. This ratchet mechanism is missing.

I am wondering if anyone knows of how this looked originally so that I can make a suitable replacement.

Thanks,

Steve

[SteveIParticipant @stevei]

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