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Not bad--how does it type? The key to platens is the hardness of the rubber. JJ Short Associaties will recoat and most platens end up under $100 including shipping. This Remington would be $ 60 plus shipping and you get the right rubber and the right diameter.
Clever fix---will be curious to see how long it holds out. By the way JJ Short would charge $ 15 each for the Underwood feed shown in the picture---and it takes 1 week plus shipping to get back.