Groovy Piano Hammers Aren't Cool...

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