Name: Sandy B. Ford River Twp, Michigan UP (Zone 4b) (Zone 4b-maybe 5a)
Rick, the clamps seem to work well with one layer of plastic over the metal framework, but 2 layers (which I have on the ends) seem to be slippery and pull out... trying to work out a solution for that! LOL, return postage could be a good idea, I've seen that happen!
“Think occasionally of the suffering of which you spare yourself the sight." ~ Albert Schweitzer C/F temp conversion