I have the HC clips...yes, they do tend to snap...especially if they have sat out for the entire summer in Florida...but what I have found is if you leave them a little loose, not a lot, but just not tightened down to the nuts...they are more receptive of the PVC...
Jeff, I would like to hear how the alternatives that you are looking at work...I don't care to replace these every year, especially since HC is raping us on the pricing...