Step 3Put the key in. Slide it in and out.
The purpose of this step is to grind big chunks of graphite into fine powdered graphite.
Every so often try turning the key to see if the cylinder will turn. That is to say, the cylinder turning when you turn the key is what you expect to happen for a working lock when it "unlocks", as they say.
If the key meets resistance when you try to turn it, this doesn't mean you've broken your lock. It just means there are some big chucks of graphite that still need to be ground. Just keep jiggling that key around until the graphite is all ground up, er... down, into a fine powder.
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