The pin uses a special spiral spring concept and its combination of strength and flexibility let manufacturers and assemblers of PC-board card locks and ejector clips maximize hinge performance.

Whether it's the front-door lock that won't let you into your own ... This works on the side, top, or bottom. Just lifting the hinge pin and squirting a little oil into the hinge will work for ...

Start by removing the locking pin (Photo 1). Then add or release tension until you get the proper close rate (Photo 2). Place the hex wrench into the socket at the top of the spring hinge and turn ...