my solution to a old problem

[butthead]

after loosing two sprocket nuts , the original oem and recently the thicker nut , my brother who is a good engineer/ mechanic came up with this.  it IS possible to drill into the end of the output shaft and tap a thread , in our case an  8 mm allen head bolt to hold a washer to prevent further loss of sprocket nuts , along with obligatory thread lock .  have to say it wasnt easy drilling into the case hardened shaft deep enough to take a thread , lots of patience not to go too deep in one go it is resistant to drilling and tapping but with careful application and patience it can be done . took most of the day to accomplish and its possible for the nut still to work loose but now it sits tight against the washer now , so cannot come off again.