I used these to attach a 1/2" PVC pipe to a painted iron frame so I didn't have to drill it. Within 15 hours the plastic washers came loose leaving a sticky disc on the frame (so I know I had a good grip on my end). I placed them about 2 feet apart so they didn't have to carry much weight. Absolutely useless. I've tried several 3/4" spacers and thought they were just too small. It's not 3M glue so I'll try replacing the glue on the pair with a good quality 3M glue tomorrow and see if that works.
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