Ha, had a issue with the Starrett dial caliber as it got out of time.
No problem says I, get out the shop light, a nice white hanky, the smallest screw driver I have and take it apart. While doing this dial clock timing I am aware that the IBTW screws are still laying on the white hanky as planned. Ha ha, now the fun starts when I try to put it back together, two screws of the 4,GONE!! What is going on here? Naturally I look the area over two or three times wondering where and how they disappeared?? Moving the parts several times I see nothing but a clean hanky. After changing my mood from friendly to POd, I grabbed the caliper and looked at it.........There were two IBTW screws magnetized to the caliper jaws. Anyway, my mood changed back to Larry the Old fart and put the dial calipers back together. I didn't drop the screws, I just borrowed them to Uncle Murphy.
Moral of this story
Don't ever give up lookin for your IBTW screws.
Larry
PS This is a blow up of 4 IBTW screws : :