There seems to be much said about regulating grand pianos, but verticals need it too - they sound and play better, and also help the piano last longer.  Here's a pdf from the Piano Owner's Repair Guide that will help you better understand what it is all about.

This is the final step - putting it all back together again.  As you watch the video, you'll notice Jamie wears at least 2 different outfits through the video -- that means it took at least two days to put it all back together.  That doesn't include the time spent back at the shop - it takes time to do things right, and that's why I'm glad Mr. Musselwhite put together these videos of showing just the work it takes on the action and keys of the piano.

Regardless, there's much to a truly reconditioned piano, be it an upright or a grand piano.  The value in this work will be music, a lot of fun and a joy for many years on this old upright - recondtioned - piano.

One of the things I learned as I went from piano player to piano technician is that here is more to piano maintenance than just tuning.  For instance, as a piano is played, the strings cut grooves into the hammers.  This will start to give the piano a harsh tone,  and the player loses control over the dynamic levels...it goes from play soft to loud, to loud and louder.

Well, anyway, here's a file you can look at to get a better idea of what groovy piano hammers are and why they need to come out!

Why the Hammers on My Piano Need Filing

Instead of reading and trying to understand what all is involved with piano regulation, Dr Howard will show you, in bits and pieces, what it takes to regulate a vertical piano on this video.