I just bought a 30-dent reed, which is too fine to get a standard reed hook through without bending the reeds. So I made my own:
These are made out of 10 mil brass (.01 inch thick) and were pretty easy t o make. I sketched out the shape of the tool on a sheet of 10 mil brass, adding 1/3" or so on the sides, cut it out with my junk scissors, and then folded over the edges to make the handles stiffer and more hand-friendly. A light sanding to remove the rough edges, and presto! It was done.
The gadget at the top, in case you were wondering, is to push threads through the reed, rather than pulling. I got a lot of advice to push very fine threads through the reed rather than pulling them with a hook, so I made up this tool to do the pushing.
I did find that the scissors warped the brass on the inner part of the hook, but nothing that couldn't be solved by pressing it flat with the back end of the pair of scissors (you could use anything smooth, but that was what I had handy.
I don't know that I'd bother making my own reed hook unless I had a fine reed, but this works very nicely in my 30-dent reed. It does tend to bend under light pressure, but it's easy to bend it back.
Just thought I'd share!