Alan Ratcliffe wrote
Looks like they are made for drywall mounting. Also not sure if they will swivel to accommodate offset headstocks.
I didn't scrutineer their site but I do recall seeing something about being able to accommodate them. If not you should be able to angle one slightly and make that its permanent spot on the wall. I shall investigate!
I actually saw a cool project on Instructables where they make a coat hook / hat hook out of cement and a lightbulb... With a little clever casting you could make these yourself.
