11-03-2013, 07:38 PM
Sorry but I don't remember the screw size. It was a small self tapper that was in with all my 2-56 and smaller screws. I normally run the L-1 on it's own, I don't think I have ever double headed it. I have used the pilot coupler to push/pull a few cars around here and there, and it has never given me any trouble.
My other car is a locomotive, ARHS restoration crew