I am the owner of an Epson HX-20 laptop computer. It runs well except for the builtin cassette drive which doesn't seem to work reliably. After carefully disassembling it I found that the belt seems to be quite loose, possibly because of the age.
What is a good replacement for the defective drive belt? How can I find out the dimensions of the belt so I can find a replacement? The maintenance manual is silent on the dimensions of the belt and I don't think that the original still has the same length it had when it came out of the factory.