When that meter was made, it was common for auditors to make footplates out of 32 oz vegetable juice cans, with tin snips and a hammer. Using them often required longer leads, so we'd head over to Radio Shack, buy a standard 1/4" right angle jack, some wire, and two alligator clips. No soldering required, just pliers and maybe a small screwdriver.
The power connector was slightly more exotic than a 1/4" jack, but I don't think by much. Replacing it shouldn't be that hard. Freezoner types probably know sites which sell replacements, if you're not the DIY type.
That said, I hope you're not going to use it for scientology. That stuff can mess people up.