I completely rebuilt mine three years ago . All the rivets and bushings were loose and would cause all the moving parts to get out of alignment /position and bind. Nylon bushings were all replaced and retained with SS bolts and nyloc nuts. Rivets that needed replaced were and I replaced the slides.
No problems last three years. Works better and quieter than new - like it was designed to.
Pictures are here: https://photos.app.goo.gl/x36zSyMVhTGDXQV17
Brad L.
2013 Diplomat 43DFT