Redlion: for controllers they are better and cost less, and if you get the right one you can rebuild them when they burn out, the folks working there know their stuff-- not Wattlows.
1st thing we did to our "new" machine was pull the elements, install 1000 watts all around, pull out the controllers installed : Redlion controls ( they have some newer stuff, just as good less money), switched out the dayton junk, switched out the motor, the ears - tabs that mount broke on several we had.
The really old units with those emersion style elements all went away, upgraded them with the 90-100 pound pots. try getting all the lead out of the pot when the element goes bad and 50 pound of lead stuck around , then what tip the machine over, no, dip a spoon in there and pour out the lead a little at a time. NO
Changed- added & relays so the machine could not pour the pot out onto the floor any more. It would reset and re-ingage after the machine would rotate and then pour again, , turned off the valve pour solenoids ( those thing suck get the air system you'll never go back) turned the motor off with that switch to keep from bending the **** metal bar that pulls from the back to front, Bent it so many times, we chucked it and replaced it with thicker metal, better grade ends to, they wore out too fast.
Keep on trucking, love to see you do this. Are you going to market them too??