No old and big caps here either but I have stuffed the taller 50’s – 60’s OMC condensers with a modern replacement capacitor. After removing the original stuffing, the end gets drilled so the terminal of the new cap can pass thru and get soldered on to the end of the can. The other terminal gets soldered onto the end with the lead and then the can gets filled with clear epoxy and clamped together overnight. Once the epoxy has set, the cap is now ready for use. This is just one way to do it and I’m sure there are more.
