I notice that most of the replacement Underwood 5/6 feet that I see online are basically a tapered rubber cylinder on a bolt. My Underwood 6 came with two feet that are made up of a rubber foot, a felt sleeve, and a metal bell (see photo).



Was this the original way Underwood standard feet were made? Or, was it only on some machines?

I thought it a pretty interesting technique for dampening vibration from the machine, and if authentic, reproduce this for all 4 feet. I was thinking of 3D printing the rubber. Not sure yet how to make the felt sleeve. Any leads anyone knows of?