I got 2 strida 2nd hand about 2 year old. Probably used for about less than 150km.
The rest of the rear wheel and belt seems ok. Thanks for your link, i finally got replacement parts from the korean site.
Replaced part 338 and seems ok for now. Will have to ride it awhile to make sure. Also ordered extra part 338 just in case.
Lets hope it is just a simple case of over tightened parts.