Just saw your post. Contact Alex at poolfelt.com and I'm sure he can hook you up with a rail cloth set. On the youtube thing it's the same for any cloth - some can be pulled tighter then others. There's several ways to do bar rails and that is just one I learned and have used exclusively since it's simple and works.

I checked out your upload to you tube on covering bar rails. Pretty simple and I feel really dumb not seeing how simple it is. Same thing for simonis or velocity or any other stretchy cloth? Also, can I get just rail cloth from you? Specifically steel grey velocity. I'm seriously considering re doing the rails on that job I did. Thanks Don