A patron was using our public typewriter*, and came to the desk to say that the backspace key was no longer working. It's an electric typewriter, and has an automatic erase/correction tape built into the backspace key - what was happening was that when she hit backspace, the typewriter was no longer erasing the character she had just typed.
I am no typewriter repairman, but to me this sounded like the correction tape had reached its end, and needed to be replaced. My first thought was a bit of terror - there couldn't possibly be anyone that still sells correction tape for this model typewriter.
However, I remembered cleaning out some cabinets in the Reference Office a few years ago, where I found the typewriter manual, as well as some other typewriter-looking odds and ends. I threw them all in a box and left them in the cabinet.
Good thing I did (but of course I would - that's what librarians do). I checked that box**, and sure enough, we had a box of correction tape reels in there. I have no idea how long they last, but I've been here for almost eight years and don't think it's been changed in that time. It's possible the remaining three reels will last another century or more.
Anyway, I replaced the correction tape in the typewriter for the patron (which took a little bit of figuring out), and she said thank you and kept right on typing.
Usually, this is my only goal - to make sure patrons can use library resources. In this instance though, it was kind of a let-down - sure, to her of course we'd be able to do this so she could continue her work. But to me, holy smokes, not only did I just get asked to repair a typewriter, but I actually found the parts to do it, and did it successfully. Yay, libraries! Tom Hanks would be so proud.
*Yes, we still have a typewriter for people to use. It's a Canon ES20, and it gets used maybe once a month. Usually people need to fill in pre-printed forms, but a few parents also use it to show kids how a typewriter works. I love that libraries offer such a spectrum of resources for people - we have a typewriter and fax machine, as well as print-from-home and a electric car charger. In fact, while I was working on the typewriter, I could hear a coworker at the Reference Desk helping someone download an ebook to her Kindle Fire.
**Also in this box was another ink ribbon for the type writer, the manual, the manual to our Canon 400 microfilm machine, spare bulb for the microfilm machine, and manual for the Canon Fileprint 250 printer connected to the microfilm machine. Now that is what I call an Awesome Box.