I use OP's spiral bit (upcut), and OP's box jig(s). They are simple to use, if need a tighter fit, as Bob would say, "use that fine adjusting tool".
I know time wise, it's best to do 2-3 at a time. For myself, I simply just do 1 at a time.
__________________
Ken
"A VETERAN"
"Whether active duty, retired, national guard or reserve - is someone who, at one point in their life, wrote a blank check made payable to "The United States of America", for an amount of "up to and including my life". That is HONOR, and there are way too many people in this country who no longer understand it." -Author Unknown
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