Plum Bob Spool

I designed this to fit a Swanson hexagonal plum bob. The inside edge of the opening has a small lip, so when the plum bob goes in, it goes in snug. Once it's past the lip though, it's looser (though it doesn't rattle) and is easy to pull back out. The end of this bob has a metal ring used for hanging the plum bob. The end of this spool has a couple of pegs for that ring to attach to, to keep the spool from unspooling.

The magnet channel can hold five small magnets. It was designed for these: