I cut the fret slot on a bandsaw. I made a jig to hold the fret board and limit depth of cut. I used maple for the fret that was sanded with a drum sander. On the slide guitar the strings are not depressed to the fret. You use a glass tube or metal bar to slide. You usually use metal finger picks on each finger. Look at pic in the case and blow it up to see the metal bar in the case recess at the bottom of the guitar.
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