All mounted up. First impressions later, but here's the install process in pictures. Pop the bolt cover off the grab handle with a flathead. Bolt underneath is 10mm and quite long.
Hmm, the piece seems a bit too wide for the handle. It won't go anywhere, but maybe we can do something...
Opening in the handle is about 16mm
Well, there's the problem
After ten minutes with a vice and a rough file:
Much better
Maybe we can find a better washer for this
That's better
There we go
Job done