Question about Kokua Jumper

contacted the importer directly with a similar question (mailbox@likeabike.ch) - they were very straightforward and helpful and were able to send me the spare part I was looking for.

It was included with our bike.
On the web (http://shop.kokuabikesusa.com/products...) the rubber ring is listed as an extra accessory, so it should also be available in Switzerland.