Well, I finally had enough digging through the box trays always looking for the one bit I needed and of course, it was always on the bottom... So, when I drilled this scrap of 2"×4" I used a numbered bit that fit the shanks snug and drilled about 3/4" deep with it. Then went in about 3/8" with an 1/8" bit. That way they slip in easy and hold tight when pushed a little. Way more efficient access to my most used ones. Also, I highly recommend the ventilated/diamond partial disc in the lower right corner, great shaper but also slick for starting band tie grooves shallow before filing. Must be gentle though because it removes material very fast. Hope this helps someone else with their disorganized criteria!