Agreed, no one picks locks anymore (except in the movies). several junk cyls to choose from is handy so you can select the tumblers to match the key notch depth(s). You want the heights "even" with the key inserted. the tabs on the chrome cover are delicate so bend them just enough so the cover will come off. & there is a specific graphite lube to squirt in there available at your parts house but it ain't absolutely neccessary.