Indeed, it is not even required that the guide tube 150 be cut in the manner suggested by FIGS. 2 and 3 as the roller latch 120 could rest directly on the protruding fence post, although in that configuration it would be preferred that some sort of stops be provided on the exterior of the guide tube 150 to keep the roller latch assembly 102 from moving the roller latch 120 past the guide tube 150