Looks like the top was cut off with a hacksaw, the tab that locates the squirters from spinning are milled off as well. Going to need a dowel of some sort to fix that. Wish I knew who did that work. I'll try to post some pics when finished.
Ive seen a few around here that look like that. Someone milled that down as you can see the shitty milling marks that are left behind. Looks to be a older Pro Systems unit. Im thinking someone milled it down for hood/scoop clearance. Ive bolted small square blocks down to locate the squirters before. If i remember corrrect I used some 2-56 screws. Good luck with that one.