Why is it so hard to find replacement O rings for these tumblers?
O rings can be made. Save the old O ring, take it to a hardware shop
or hydraulic shop. There they can be made to order. Get several for
You can make them yourself if you wish. Cut to fit with a clean
single edge gem razor blade. then glue together with a good super
glue. A better way is to weld both ends together with a clean, hot,
cheap, knife blade. Get both ends hot simultaneously and then push
the ends together. Some slight flashing will be left at the junction,
just trim it to a smooth.
There are power transmission " O rings " which are available. These
are tougher, otherwise they work the same. I remember them being red