Not sure how much ferrous metal is those things , but I re-roofed here and spent a bit of time with two different magnets , amazing how close you have to get the magnet to get it.
Every time I lost something on the job and couldn't find it I have gone back a day or two later alone with no time or job pressure and search again. High success rate with this tack , and I often think , shit I went right by it yesterday.
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