HP-48GX key stiffness

[anyfoo]

Hello,

I recently got my first HP-48GX ever, also the first HP calculator of that era that I ever used. I think I lucked out a bit: It has a serial number starting with ID21 (so one of the later issues, I think), a high contrast black LCD, and looks like new. There is some tiny indication that it may have been used at all, but if so, it's been taken very good care of.

The only thing which I'm wondering about is the keys. Besides some light creaking, they are primarily very stiff. They seem to work flawlessly and give a good click as confirmation, but I feel that I need to use more force to engage them than I needed on most other non-cheap calculators so far.

Are they just that stiff and creaky, or is there a potential problem?