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I've been refurbishing/rebuilding a 1910/1911 Whitney player piano that started out life with a Kimball player action which was at some point during its life removed. This means there I've found a few leftovers as I've disassembled the action.

The piano has three sets of regulating buttons. The first is the normal let off regulation buttons that run along a rail inside the whippens - no need for explanation.

The second are a row of individual buttons on the front of each whippen, just in front of the bridle strap. These appear to be player remnants as they touch nothing and appear to serve no purpose now. I'm going to remove one of the screws to replace a broken screw I found on the let off button rail as they're the same size. I'm considering removing all of these buttons because they have been cumbersome while polishing and adjusting the damper and bridle strap wires.

The third set of buttons are on three rails (bass, mid and treble) that run along the bottom of the sticker rail and make contact with the inside of the sticker flanges. They appear to brace the sticker flanges and regulate how high the stickers rise. I can't find any references to these in my books or online and am unsure how to adjust these for proper regulation. Does anyone know about these or have any advice on regulating them?

The second set kept the pneumatics from closing too tight.

The third set is also for the player and is not necessary when the player is gone. They keep the wippens from rising too high.

Thanks! Good to know. I'm so glad to have joined this forum. Have been hunkering around for a couple months on this project on my own pretty successfully but am glad to have a venue to just ask some of this stuff.