If you ever need to fix the wiring in the hood of the VPM2, then follow these instructions . . .
As the VPM2 ages parts on the unit can begin to fail and can cause vacuum loss. If vacuum falls too low the unit will not mix and can even keep the bowl from being held in place.
The difference between hand mixed and Vacuum Mixed gypsum and Investment products is obvious to the trained eye. However, what might not be obvious is how to choose a Vacuum Mixer when your current one wears out.