actually after a ton of searching there was a video with some great info. if anyone else needs help with the ones that you can't slide, take a slow lace (preferrably a thick round one) and slide it under the top part of the rail cover. hold one end tight, but the bottom end of the cover onto the rail and slowly and powerfully pull the lace in such a way as to pull the top edge of the rail cover outward and push the rail cover down as you do so. it takes a tiny bit of time but makes it a world easier