Remember back in the '70s when Ruger advertised that they used 'nylock' screws on their guns. Whoa, I'm really dating myself with that one! Those screws had a little plug of nylon embedded in the threads to keep the screws from working loose. Anyway, somewhere along the line, Ruger got away from that. However I just tore down my 'New Vaquero' last week and found to my surprise, Nylock screws holding the grip frame on! That is definately an improvement. 44 Man