Howdy Bill,
Yep, the pins are great to use too. Just reading that some folks thought it was too difficult to make these wonderful WWs. I've made many different types of sliderules over the years, both circular and straight and found that drilling the holes through the plastic caused small rips and snags, or the drill bits would run off target, unless pilot hole was started first, of course. I finally settled on the burn-through method as the quickest and most accurate; but, thats just me.
Cheers,