Using one to loosen lug nuts (or other 'breaker-bar' type use) is not good; if you did much of that I'd check it at least. If you call around, either a Snap On dealer or perhaps even a tool/auto parts store may have a tester you can come in and use to check yours. Or do a home test (like in the video, but use a known weight). If it isn't close to spec, probably simpler to replace unless yours has an easy adjuster. I found a basic Craftsman 1/2" that is fine for lug nuts for about $50. And get the real lug specs for your car - M2C uses 106ft/lb, not the 88# noted above.
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