paul 2 posted:I remember when they were just pins with no hump. And having to be careful that when putting sections together the pin would at times slide all the way into one of the track. Then they started adding the hump which preventing the sliding.............Paul
The little hump is so small that once it is just a tiny bit in a rail, it holds firmly and does not distort the rail itself. No real danger that it will easily slip further into its respective rail, and the open-ended rail that this rail attaches to will grip the protruding end of the pin tightly enough. At least that has been my experience.