I always had this issue so I always thought it was how the slide sounds.
1) The slide seals and there is no water leak
2) When I half open the slide and measure from wall to end. the difference is 1/4 inch more on the rubbing side.
Issue. THe cyclinder when it retracts or extends rubs on the brackets that have the holes in the frame . SO you get the loud metal on metal noise half way in and out.
Online I only see seal adjustment or vertical/horizontal adjustment
but never one of these . If I do the horizontal will it help. I am going to try it a few minutes and then see. I do not think so it really does not move the cylinder or bracket. THe braket has no nuts but a round head.
I could make a video if it helps.
2014 avenger 28 bhs
2008 Toyota tundra crew max
guarded by bear the mini dashound
running from payload police edition