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John, yes they are good. I thought about including them, but this was a help for people who do not know much about fasteners. These folks would not have a hammer drill, or adjustable clutches on drills, so I did not want to confuse people.
This would be a good 'advance course', so maybe some day I will do something on Concrete.
Thank you for expressing interest and sharing your experiences.
I didn't know if anyone even read these tutorials.
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