Looking for some help - I've had the single bob revolution for over three years and loved every minute, however, the front wheel recently stopped locking, so I now can only run with my double bob revolution and have to reserve the single for walks

I checked with BOB about the warranty and the nearest authorized repair shop is over two hours away so not an easy option. I'm hoping that with a bit of guidance my mechanically inclined husband can get the stroller back into jogging condition.
Has anyone else had a similar problem? Suggestions?
Thanks for the help!