I've had good results with gentle use of metal polish to remove light rust
like that.

I mostly use Wizard Metal Renew currently, but Simichrome, Wenol, and
Autosol give similar results. 

--Chris

Check out H-frame, the site for vintage Black & Decker Workmates
<https://h-frame.weebly.com/>

-----Original Message-----
From: oldtools@g... [mailto:oldtools@g...] On Behalf Of Dan Beck
Sent: Sunday, November 21, 2021 2:10 PM
To: oldtools@g...
Subject: [oldtools] Adjustable Knob for a Johnson Combination Square

...(stuff deleted)...

Also wondering what the easiest way to remove the minor rust on the ruler? 

https://groups.io/g/oldtools/photo/270151/3339689?p=Created%2C%2C%2C20%2C2%2
C0%2C0