Have been using a Halo for a week or so and it's a fantastic machine. My only problem is that I don't seem to have enough grip in my hand anymore to really tighten the tube vice. Not a fault of the machine as I've adapted a pair of pliers to tighten it without damaging it and it does tighten properly.

Ive been looking for a wing bolt to replace the existing one but can't for the life of me find one with the right thread. I assume I'm just being as thick as shit but I've tried loads, what size do I need?

Any help much appreciated so I can stop scaring customers with my pliers!