Reply to "connecting modules"

I went to the show and two different clubs were there. They both used c-clamps for their modules, saying that it was the easiest  to do quickly. The o gauge club said if up for a longer time the put pins in the outer rails, even though it was a pain, but held the rails even for a long time. I have used t-nuts for a lot of other things but think the holes will still get reamed out over time. I like the roto-lock and might give them a try. thanks for the advice everyone.