I have screws on both the front door and the armored door, and they started sticking around the same time. The lock on the security door wouldn't even let me put the key all the way in. I didn't think adding wet lube would be the best solution as it can attract dirt and further clog the mechanism. After searching the internet I found that Graphite Dry Lube is highly recommended. I found this particular brand at a reasonable price. It arrived quickly and I squeezed the bottle gently to get some of the product into the clasp. Then he worked a little with the key until the key moved smoothly. Now both locks work like clockwork. This stuff works like magic!
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