After finishing my table about 10 days ago it has been getting a few hours a day of use. I know all the rails were nice and tight, I made an effort to make sure the tension was the same all around to the best of my ability. Now I have two spots where the cloth is pretty slack, enough to pinch it. My research here is telling me that the cloth won't stretch (Simonis 760), any chance the cloth is slowly sliding out of the feather strip (they were tight - not worn)? Staple holes growing larger? It is in two areas, close to pockets but the pockets seem OK, no slack in them. Anyone have experience with this? Thanks guys.