wheeler dovetail cutting fixture

Brownells had(has?) something similar as did Track of the Wolf ... but none are in Canada. Probably not available any more because they are not super useful ... you can layout and hand cut a dovetail by hand in about 15 - 20 minutes with a little practice.

Assuming you want one because you have to cut a dovetail in something?
 
Brownells has 3/8" dovetail-cutting files, modified Vallorbet parallel-side triangular files with a safe side. Work Ok if you take your time.
 
Flops around, or just won't tighten up?

Flops around, you wont fix with a filing jig. Just loose, you may be able to deal with by taking a flat nosed punch and a small hammer, and gradually displacing the metal from either side of the dovetail back in to line.

You might steal an idea from the likes of Cooey and a bunch of others, and find a rear sight that mounts with a screw in to a separate dovetail piece. Easy enough to file a set of matching angles on a small piece of stock, drill and tap it, and slide it in place.
 
lots of options

already mentioned:

- peen the edges of the existing dovetail slot once the sight is in place
- cut a new dovetail and replace

You can also:
- put a small set or fillister screw through the existing dovetail so that it bears against the barrel
- drop a small bead of solder on the existing sight base
- just solder it on
- drill a hole in the existing site and use a center punch to peen that into place

your best bet is to peen/stake the existing sight into place without modifying anything.
 
The model 24 has a small, and shallow dovetail this is a very common problem for them. Even worse, the factory rear sight is fairly long and easily bumped side to side which destroys the tiny dovetail. I have seen more than a few soldered in place, you could also remove the rear sight and add a rear peep which was also very common on the M24.

The last one I had I made a tight fitting, much smaller, solid rear sight that worked well. At the same time I made a new front sight and trigger guard. The early M24’s were nice, and well regulated.

 
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