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 Repairing a Lark lock cylinder projection
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Posted - 01/27/2010 :  01:15:33 AM  Show Profile  Email Poster  Reply with Quote
A couple days ago I had my Lark's lock quit working. I came out of the gas station, unlocked the car, and without warning the lock just spun in the door, and the inside lock just sat there. Well today I popped it loose from the door. Upon following Bob Johnstone's instructions on servicing the late model lock, I discovered the projection sheared off. This projection is no larger than 1/8 long, aluminum(I think), and over 40 years old. It's also what makes the whole lock, well lock, which is ironic really, but that's me. So at first I thought, well let's try JB weld.

While the JB weld was curing it dawned on me that this was not much more than a stud, and there was a better way to repair this. This doesn't do much more than engage a cam at the end of the cylinder, which turns the shaft back and forth to raise the lock button. So I cleaned off the projection, dimpled it, and drilled it out with a 3/64 drill bit, and tapped it with one of my amateur radio, electronics, or stainless steel machine screws. These are very very tiny screws which might be used to hold down a circuit board, a heatsink, or something that is compact. I then used a file and Dremel tool, and filed it down to the length of the broken off projection, and put it back together. I also had to make sure that the screw was not into the keeper, because then the keeper would not slide down the cylinder.

Success!! the screw engages the cam, which spins the shaft. When I grab the shaft, the key stops turning, which tells me it's far enough in the recess. Now, let's see what happens tomorrow when it goes back in its home position. Here's the pictures of the work.

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