As I recall, wasn't one of the issues with the J/O Counter the problem of getting the Delrin counter assembly to adhere to the gear assembly? I think Paul Oerth found some Super Super Glue that did the trick. The only failure I've ever seen in a J/O was due to that, and why I still keep (and treasure) my original wired-on Jones Counter.
Any potential problems in this area with the JR?