Eric - the "Loft"
 commented about 3 hours ago
The little knobs look good Ross, and I agree you can get the leverage needed. As for the bolts, try a toilet bolt, no cutting needed, providing they fit the track.
Hi Eric - The head of a toilet bolt will straddle the track slot opening, but it doesn't lock in place because the head isn't large enough to engage with the walls inside the track.  It could still be used, but I'd have to be careful of the head alignment before tightening down the fixture.