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Great paper, Just a note on 30 TPI etc. I do a lot of early antique car work and have found a lot of screw pitch that is between NC and NF. before 1915 about lots of screws were 10-24 or 1/4-24 for example rather than the 32 and 28 standard. Delco on their distributors used a 10-30 well into the late 1930's. you never quite now what you are going to find on early stuff.
Just some tidbits
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