I had a job recently where myself and an apprentice had to gland and terminate a 50mm SWA cable in a panel. I put the locknut in a vice and filed V shaped notches in the 6 leading edges. The apprentice was curious as to what I was doing. As we installed it, I got my trusty old screwdriver out and hammered the locknut tight as my assistant held the gland with his stillies. On completion, he said that it was dog rough, but so difficult to tighten with gland nut pliers. I would be interested to now what others think.