I bought these as stock but based on their numbers I suspect quite a few of them are suffering from the same problem. The plastic part that is supposed to fix the lock breaks (or I already broke it). I repaired mine by drilling a small hole at the latch of the lock and inserting a screw. I cut off the plastic cover a bit to bypass the screw and now it works great. You also don't have to worry about this plastic part breaking in the future. So if you get one of the great deals on returned items, you can quickly fix it with a screw.
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