I got these hole punches from my dad. Most were commercially made. Ones at top were made by dad on a grinding wheel. The small gaskets at side were made to place against old copper and fiber washers on carb bolts of my Elto Ruddertwin. Cork washer is for the carb needle nut. Took two to get correct thickness. Outside and inside holes were made using two different sizes. Tip: make large piece first. Aids in centering inside hole. Samples shown were my first attempts. Believe such punches are still available.
