I got it.
I used a spray carburetor cleaner that had a long tube that would go down into the lock taking care not to splash the cleaner on plastic parts.
I set the Segway on its side to put the lock facing up.
The manual says that you insert the key, turn it clockwise, and pull the lock off. Once off turn the key counter clockwise to remove the key.
First I left the key in and tried tapping on the lock from different angles but nothing happened. Once I used the carb cleaner it took a few tries, but then the key slipped into the lock farther. Now instead of turning 90 degrees it turned 180 degrees clockwise. Voila! A little rattling it around and off it came.
One thing that was confusing to me was that the key would turn. In normal locks if the key isn't in all the way the lock won't turn.
So the key goes in the lock, turns 180 degrees and this releases two small steel ball bearings that sit behind the bulge on the special pin that replaces the screw. You can see a view of the pin in the manual I found online. The key must then be rotated back 180 degrees to the lock position before the key can be removed.
I'll use dry silicon lubricant and then graphite to lubricate the lock internals. If it doesn't work perfectly smooth it's going in the trash can.
Thanks
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