I've been doing it all wrong for 30 years then. While I have a thread chaser set (mostly for the thread files) I use taps and dies for fasteners and holes.
Me too....... guess I have been doing it wrong for 30 plus years also.,.....I just use tap and dies....I mean the diameter and thread pitch size is what it is......as long as you have the correct size, it is not going to cut any "new" threads.....Just clear out the **** and debris that shouldn't be between the threads anyway....and help restore the high spots of the threads....And for blind holes I use bottoming taps....A fool and their money will soon part
