HP-41 Bad ALPHA Key (not sticky)

[Ángel Martin]

Guess it was inevitable but one of the old soldiers is showing signs of decay:

a bad ALPHA key, that does the toggle click and has no sticky problems but it doesn't "register", i.e. you must press harder (after the click) to get the contact to happen.

I already tried soaking it on Isopropyl Alcohol but to no avail. Any ideas for a realistic repair on that one?

Thanks,
'AM