ended on April 10, 2013.
If you can't find any, heat shrink. I have an old Underwood parts machine. Either email the dimensions or good photos of them and I will see what I have. I will not have time to take my 4B apart until about September. From this week on I will be super busy and/or travelling.
This might sound crazy, but maybe you could find a carpentry shop and ask them to turn a duplicate roller with their lathe. Could be made of soft wood, say pine, and the axis could be made with a piece of wire like the one used on large furniture hinges. In theory, if properly made, it should work decently.
You could check again here for a solution to worn feed rollers.
I know you found a ingenious solution - but before I try something irreversible, I thought, I'd try to find a matching replacement - easier said than done.
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