do chains really stretch?

... The tensioner that you are all describing was not design for a roller. ...
Yep! that's what I was asking some posts ago. Does Cloyes make a tensioner for a double roller? I still think a tensioner is better than nothing. both 273 and 318 I broke down had more than an inch deflection, and none had a nylon cog. Truck 360 double roller looked as bad. Ill still look for a CAT GD-318 gear, mods needed or not. Sold 2 Milodons..should have kept one...