The coupler on my NTM Fleetwood Cheyenne is noticeably difficult to open and close. The previous owner had been hitting it with a hammer to get it to cooperate, but I searched for a repair kit thinking it would be a wise thing to replace to extend the life of my PUP. Unfortunately the kits arent sold anymore, so before taking it in to get it replaced altogether (requires cutting off existing and welding on replacement), I've been cleaning it up and applying lubrication, as was suggested by a few very helpful forum members. I have included a video and photos to show that although the open/close mechanism up top now moves more freely, nothing on the underside seems to move at all and from videos I've seen online, as you open it up top, the guts inside/underneath should be sliding backwards to allow the ball to come in and then as you close the yoke, those same parts should slide forward again, "capturing" the ball. Any ideas beyond the clean up/re-lube efforts? What am I missing in trying to understand how this silly (but critical) part is supposed to function? I want to be safe and will have it replaced if necessary, but want to cover all bases if there is anything else I should try first. Thanks in advance!!!