Question: Tom can you educate me on bolts. When I come across a bolt that looks new/modern, no rust etc.. sometimes I will see two things that give me pause that I don't understand. Sometimes the hanger will swivel which means the bolt is not screwed all the way in but the bolt is not "loose" - it does not wiggle or anything side to side but clearly it is not tight up against the hanger. What is going on? Did someone not screw the bolt all the way in? Do I need to tighten it? I thought these things were glued? Did someone not drill deep enough? Thanks again for sharing. Cheers, ********* Answer: A spinning hanger is at times an indication of poor craftsmanship. At other times, for instance, when MY bolts spin, it is just what happens with the soft rock. By itself it is not a problem. Most bolts used in canyons are not glued in. They are Expansion bolts, which means at the back of the hole there is a cone/wedge thing that expands when the bolt it turned. Generally, this pulls the bolt in tight against the hanger. But, a little erosion on the surface and the hanger is no longer held tight against the rock. You should not tighten the bolt. Actually, let's be clear. There are two general kinds of bolts: A. what is sticking out of the rock is a threaded shaft with a hanger and a nut. If these are loose, YES, you should tighten the nut. B. what is sticking out of the rock is the hex head of a bolt. These you should not tighten. Tightening it tends to make it worse. Unless the bolt is actually loose in the rock (ie, you can turn it with your fingers) in which case... things are bad. And yes, you should tighten it, or find another anchor. Hope that helps. ***** Further bolt inspection comments, please?!