>I have never heard of a spotweld cutter. How does one actually use them?
Visualize a small (3/8" or so) hole cutter. Protruding from the center is a
sharp, spring-loaded point; it extends past the hole cutter.
To use it, you center punch the spot weld, and align the point of the spot
weld cutter with the punch mark. As you bear down on the drill, the point
retracts, and the hole saw cuts the metal. The point keeps the hole saw
centered.
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