Yep, the hex bit on the end is effectively a lock nut for the threaded sleeve that sets the spring tension inside the knurled handle, can come undone...
If it's this one, put some decent tape around where the end cap meets the main part of the handle, there's a threaded sleeve inside that acts on the...
funny it was Avs dad, as I stole this idea from Billie fuller 's Dad. who had let us use their own at Teretonga a few years ago.
I couldn't find one...
i can't exactly remember there might have been more than one maggot ,it was more a did at dangerous and CX's but there were so many bike in a two bay...