But it is possible to make from brass DIY I think, by brazing three things together, and using a cup washer. So long the pin is the correct dimension it will align everything, then even if you have a crappy offset miniature bolt in the middle, because you drilled it on a drill by eye with a wobbly vise.
So I can get the correct dimension brass tube, cut it to lengh to make a stub, drill it, put a smaller brass bolt in it that sticks out a bit, put it on a brass disk, solder it together, then braze two different ID washers together to make a washer that has a ciruclar flange thing, and it should compress everything. I think I can line up a bunch of these stacks and braze them all on one go on a fire brick if I can't find the correct part. I would probobly make it a square bolt because its easy to cut.
Since there is 4 of them, it should hold