Having dealt with old vacuum switches there is no way I'd restore an old one if a new one was available. Once the nipples break off due to age it's just a matter of time. Especially since a new 5 button switch is $120.

Original Air will restore them, too.

If you want to try yourself, some info

https://www.forbbodiesonly.com/moparforum/threads/vacuum-switch-repair.164146/

there are some sort of very thin hardboard looking sliders inside that move around to open and block the various vacuum ports that tend to get old, dry and fall apart. So if yours are bad, well good luck trying to make new ones. Also, the electrical part of it, especially the blower circuit, tend to heat up and start warping/melting the plastic. I tried to DIY the one that was originally in my 65 Cuda, with mixed results, but ended up replacing it with the part number I mentioned above. If you can find one a Standard Motors HS101 is their version of that part.