I wasn't expecting much from this tool for the price but it works very well. I've tried using a center punch to give the spring loaded pin something to start with, but I can't seem to get it to work without the drill bit moving. Instead I drill a small starting hole with a regular drill and then use this tool. I didn't count how many spot welds I drilled. My best guess is around 40 and I'm still on the original beat!
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