We experienced some expansion/contraction and the fastener was compromised. We had been blocking with 5-lb cinderblock. Also, fishers here in Maine need streams and the nearest stream is 2 blocks away and (fool me!) it was figured it would be fine. Well, they have hands! and are strong...and I had never in 6-8 years had such an experience. Well, look out - I'm taking the lead with predator precautions! I found them - so awful...
I researched the devastation - only culprit possible based on evidence - fisher!