On my Neos 1000, I started noticing after I clamp, the clamps are sliding back 1-2” on the glide bars. I took them off, and noticed that where they contact the glide bars on all sides is shiny and smooth. Are they supposed to look like this or is there supposed to be an abrasive coating that allows it to grip the glide bar? Or is there some type of adjustment I need to do so they are tighter on the bar? Thanks in advance!