<https://forums.musicplayer.com/topic/141625-new-project-steinway/#comment-2136052>
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"BTW, I did pull the action, first day.  Back when I was young I used to cruise the UMich campus area playing all the avaliable pianos in dorms, the Union, Law Quad, etc.  A lot of times these pianos had wonky keys, so I'd bring a screwdriver, pull the action out, and fix them.  Fortunately I never got caught, and I kept the pianos working reasonably.  (The most common problem was a weight added to a key to balance it working its way out and rubbing on a neighbor key.  Other times there'd just be crud in there to clean out, or a part to just carefully work back and forth until it worked easily again.)   \nI was hoping to find something obvious I could do with this action, but no luck.  With only a few minor exceptions, all the parts look like they're working correctly, and I didn't want to fiddle with the various adjustments.  I did try a couple just to see but they didn't help so I set them back.   \nWhat was clear was that across the board, there's just too much friction.  Hammers don't fall back quickly; the pushrods that push the damper up doesn't fall back, etc.  I'm sure that any resistance to returning is even worse when striking.  I don't mind a heavy action, but this is more stiff than heavy.   \nMaybe google will help me find more info on all the things to fiddle with on a Steinway M action of that era.  But ... I think I'll let a good tech take care of it.  There's a huge difference to making a key work like its neighbors, versus making a shift in the operation of all of them. "
<https://forums.musicplayer.com/topic/141625-new-project-steinway/>