Micromoog 6-position rotary pot came apart

I’m currently trying to get a Micromoog up and running. On one of the 6-position mod pots, the aluminum shaft assembly has separated from the rest of the pot allowing it to be lifted from the pot. The design of these pots seem unlike any other pot I’ve come across. I’m speculating here, but it looks as if that section is solely used to move the plastic switch that is embedded in the base of the pot. Were these initially glued in place or how were they attached? Can it be reattached or does the separation of these elements render the pot damaged beyond usage? (I’m not sure if it works yet as I have other problems being fixed as well)