Yesterday I was in the shop. I'm not do any scrolling so I was putting away a gross of blades I had just purchased. I had just sorted three dozen #1 PGM blades to make sure the lower end of the blade went into the tube first. I only check one blade per package assuming all other blades are the same. I was about to place the last of the three dozen blades in the tube when I picked it upside down. Three dozen blades hit the floor. Since I'n not do do anything but sit around and wilt I gathered them with my magnetic picker upper and checked each blade for bottom orientation. At least it did pass some time for me.