Of course the parts are going to fall out when you disassemble as the rotating contacts are just two plates with springs underneath them for tension against the other half of the electrical part of the switch.
The mechanical part (tumblers) is what you need to clean and lube -- while the electrical half is off. Not while it is completely assembled.
If it is not getting wet and the tumblers are binding, check to make sure you don't have a lot of keys on the key ring weighing it down causing the problem. Think GM and its switch problems.
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