New answers tagged fastener
Depending how light your object is, a rare earth magnet will do the job nicely for some values of "light" and the particular magnet. Small ones are pretty affordable, hefty ones get expensive.
Epoxy! And you can do it to the paint, or scrape the paint off first. The later is stronger in general. Almost any common hardware store epoxy will do. And, should you change your mind, a good whap with a chisel and you can take it off cleanly.
Two nuts can be tightened against each other so that they won't come loose. A single nut can be tightened against whatever it's holding, and if that's wood, the nut can loosen as the wood changes size with changes in humidity.
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