Need to make a precise measurement or adjust a tool? Get yourself a set of square shaft keys.
Shaft keys come in different flavors and shapes including curved, square and tapered. We’re looking for the square ones. Every hardware store has a set of shaft keys in a dusty, seldom opened drawer. My local store carried shaft keys between 1/8″ and 1/2″. You can buy a whole set for mere dollars. I used a sharpie to mark the dimensions of my set of shaft keys.
I use them mostly for setting the depth of my router and table saw. Using your sense of touch, aided by a shaft key, is much more accurate than using your eyeballs and a ruler.
But I also found them handy for assembling a new fence over the weekend. I wanted 1/4 inch gaps between the fence slats and used a shaft key as a spacer when I assembled the fence.
Stuff the stockings of the accuracy challenged housemates on your Christmas shopping list with a set of shaft keys!
Thank you to Bob Van Dyke for initiating me into the mysteries of the shaft key.
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