petehoovie
Well-known member
A holesaw was a real luxury item back then. Even today a nice setup is big money if you don't use it for work. The 1/8" holes joined would certainly show that the job was done 'in a workmanlike manner'. I'd think that following up the procedure with a Large tapered punch or perhaps a broken truck axle could fold the tabs over and provide a nicer rest for the heater hoses. There I go 'Churchin it up' again.
Greenlee Hole Punch is the way to go.
Greenlee 7235BB Knockout Kit Hole Punch Set, 10 Piece, 10, 12 ga. Steel, 1/2" - 1-1/4" conduit size knockouts (hole size: 0.89" - 1.70" or 22.5 mm - 43.2 mm)
https://www.amazon.com/Greenlee-7235BB-Slug-Buster-Knockout-Conduit/dp/B000LDEZNO/ref=sr_1_7_mod_primary_new?keywords=Greenlee+Hole+Punch&qid=1641962938&sbo=RZvfv%2F%2FHxDF%2BO5021pAnSA%3D%3D&sr=8-7