Like so many things in the photography world, there's a a wide range of specs and pricing; here's some offerings. Some will argue for fairly high end stuff, I tend to go slow, since they're easy to lose. I bought my C3 new in very early 1958, it has the two flash jacks, and you can see some of the business end in that previous photo. In general, the longer a cable release is, the harder it is to push -- and if your C3 is like mine, the shutter release is pretty stiff as is. I find something around 8 to 10 inches is usually enough just to isolate vibration. If you want more of a remote release, you might get into the air bulb things which I have zero experience with. For self portraits it might be simpler to talk a friend or neighbor into stopping buy and pushing the button.
The locking releases can be used with the bulb setting (a quarter turn of that top hat shaped piece around the shutter button) to do long exposures for night shots, that could be useful.
The C3 was made over a long stretch of time and there appear to have been quite a few mods along the way. It might also be that yours was used or abused with cable releases being screwed in and out, or maybe even banged into something and the cable fitting knocked out stripping the threads a bit. It's a tapered thread that seems to be about a #6-32 at the widest part. I used a 6-32 press nut to attach a cable to a pinhole body cap on one of my cameras.
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