Clamps loosening in transit

[rth_discos]

Trying to keep an eye on my setup time, and realised I'm spending a fair amount of time tightening up the G clamps on all of my fixtures.

During transit, the wingnuts keep coming loose.

Any ideas how I can keep this nice and tight so that I can just hook the lights straight on each time, rather than tightening them up?

Thanks!