✅ SOLVED Old screw on key?

[savinghistoryalway.s]

 

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[searcher]

Thumb key or thumb screw.
Used on some saws and other tools, but also on the downlink for a sink pull up drain-

 

[savinghistoryalway.s]

Thumb key or thumb screw.
Among other places used on the downlink for a sink pull up drain-

Thank you so much

 

[Blackfoot58]

They are used in many applications; often when an easy adjustment may be needed.