02-09-2021, 09:10 PM
I agree with macphanatic's approach if doing it yourself...jig with a plunge router and bushing. The jig could most likely be 1/4-1/2" material, spaced appropriately for the slots, glued or end-screwed together. I've done some routing with park sign stencil kits and the template material for those is pretty thin, but I'd be worried about sag across the longer span of a radiator vent slot.