It would be way better, cheaper and quicker to just bolt them down with a nut and washer on the inside of the beam. I did two Mozzy traveller tracks a couple of years ago and they took about 30 minutes once I had the spanner taped at the right angle on the stick.
Jeff Southall Current boats Nacra 5.8 1703 Animal Scanning Services Nacra 5.8 1667 Ram Raider Nacra 18 Square Arrow 1576