HP 45 Keys

[aaron218]

I fixed up an HP 45 calculator and everything went ok, and it all works as it should but now the keys kind of rattle if you pick it up and shake it. They feel fine to use but it's a very slight rattling noise, only if you shake it.

My question is, do they all have rattly keys like this? I can't remember what they were like before. I'm almost certain I assembled it correctly, there's nothing obviously misaligned or extra parts.