Bridgeport 440 volts to 220 volts.

I am about to hook up a Bridgeport Series 1 CNC that is wired for
440. I have the manuals and it shows and tells how to change to 220
which I need to do.
The part that I am in question about is the overload heaters that
are in the switch. The manual says they are hard to get at and that
they recommend getting a new switch wired for 220.
I looked in the switch box and I can not see the typical heaters.
Has anyone ever changed those overload heaters out so as to be able
to run on 220 volts?

Thanks

Gary