Not all belts are the same size. JCM registers have their model number on a small silver plate near the power cord inlet. you will need to contact a local supplier. They are very rare now.
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If anyone is looking for a JCM cash register manual, C-tech has them here:
http://the-checkout-tech.com/manuals/cashregisters/jcm1.php
Registerman
January 2012
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