Likes: 
Years ago I decided to change the battery in my AMW-707, and I messed (or I thought I messed) something up in the process: one of the push buttons wouldn't spring back (it had worked fine before the disassembly). The way I remember it, I thought I must have lost some small part important for that button action. I planned to send the watch to Casio to fix it for me but in the end I never have.
Fast forward to today, I had a look at the watch and nothing seems to be missing, it's just that that one button seems a bit lazy springing back. It looks like this (sorry for the poor quality pics):
And the movement has those contacts, obviously:
Is there anything I can do myself to make that button more responsive? I was thinking treating it with WD-40 (either regular or 'specialist, fast-drying contact cleaner') and/or some oil/lubricant. Or should I just not mess with it more and send it to an authorised service (I'm reluctant to do that, trust issues etc, but will if you advice it to me here strongly enough). Cheers!
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