3-D printed rubber washers for Olympia SG1 body frame. https://www.ebay.com/itm/317432465869
These appear to be the replacements for catalog part number 34280 - 5x.6 for the spacing washer (rubber) 5mm ID, 12mm OD, 4mm thick on page 61 of the Ames Supply catalog at https://site.xavier.edu/polt/typewriters/OlympiaSG1parts.pdf
it probably needs new feet too. I snagged a rubber urethane jeweler's pad off Amazon for $9 and it's enough for 4+ machines. Better than the $35 I saw online. The feet are just 1x1x1/2 in blocks. I cut them a hair big with a utility knife and many passes and sanded them to fit. Kinda messy.
Remington Portable Typewriter replacement feet: https://makerworld.com/en/models/1397399-remington-portable-typewriter-replacement-feet#profileId-1448637
Rubber feet recommended via u/scottconnors at https://reddit.com/r/typewriters/comments/1k93kbs/1938_royal_model_o_odette/