Hi there, Here's the installation steps for the Steinbuhler action for a S&S D; I've never done this, but this is what it says; I hope it helps those interested.   Best, Paul 1.  Preparation before starting. Remove the two filler blocks from the bass and trble end of the keyboard.  Remove the soft pedal plate from the underside of the frame.  Make sure the glide bolts are screwed into the frame off the bed of the piano.  Make sure the key frame shift screw is screwed in out of the way.  Slide the dag block plates into the frame and tighten their bolts.  Remove the key stop rail. 2.  Setting the plate on the left side of the frame. Slide the action into the piano and see how the hammers line up under the strings.  Add or subtract shims in back the plate on the left side of the frame to give the hammers the best average alignment under the strings.  The individual hammers will be adjusted later to position them under the strings. 3.  Setting the glide pins. Slide the action into the piano and move the trble end in and out while striking treble notes to find the optimal position for the trble hammers front to back.  The treble glide pin can now be set to mate with the slot in the cheek block.  Add or subract shims in back of the block that holds the pin so that the pin is in the proper position left to right to mate with the slot in the cheek block.  Then adjust the pin front to back and up and down so that the cheek block will hold the frame in its proper position.  After the treble pin is set, follow the same procedure to set the bass pin making sure that the key frame is parallel with the front to the piano. 4.  Installing the soft pedal lever plate. Measure the distance in the piano from the left frame stop to the right edge of the soft pedal lever.  Attach the soft pedal plate to the bottom of the frame and position it left to right so that the distance from the left edge of the frame to left edge of the plate equals the above measured distance.  Put the action in the piano with the cheek blocks in place and make sure the soft pedal is working correctly.  Adjust as needed.  Adjustment screws on the right side of the plate help keep the plate in its proper position.  Shims may be needed under the plate to put the plate at the proper height to mate with the soft pedal lever. 5.  Setting the back rail height. The keyboard has been designed to be able to change the height of the action stack by about .300"  In our shop the elevation blocks in the back rail were set at .200" below the frame and then the action was regulated to the standard.  The action can be raised another .150" above the standart or lowered .150" below the standard or even a bit more to accommodate variations in the string heights when Steinway installed the harp.  Generate the string height graph and compare it to the standard.  Make the appropriate adjustments in the elevation blocks in the back rail.  Put the action in the piano and insure the let off is appropriately below the strings.  Make adjustments in the elvation blocks if necessary. 6.  Bedding the front rail. Remove the keys from the frame and mount the action stack.  The frame is now ready for bedding.  In our shop the 5 elevation blocks in the front rail were set at .065"  .090"  .105"  .090"  .065 below the frame going from left to right.  This gives a .040" crown under the front rail as per Steinway specifications.  The height of the glide pins at the ends of the front rail can then be adjusted up and down to insure that the ends of the front rail are bedded when the cheek blocks are in place.  This should remove all knocking in the front rail. 7.  Bed the balance rail. Before we did the regulation of the keyboard in our shop, we bedded the balance rail to our bench with the keys off and the action stack mounted.  So with the keys off the frame and the action stack on, bed the balance rail in the piano using traditional methods.  This will preserve our regulation. 8.  Set the sostenuto bar on actions for steinway pianos. In our action, the sostenuto bar is mounted from the frame and not the action stack, so it can be easily adjusted in the piano with the action stack off.  Take the action stack off the frame giving clear access to the adjusting screws and place the bare frame in the piano.  Adjust the sostenuto bar up and down until the bar is just above the underlever tabs and then adjust the bar front to back until it works properly.  Test by first depressing the damper pedal and then the sostenuto pedal to see if all the dampers continue to be supported after the damper pedal is released.  Also, while first depressing the sostenuto pedal, depress and release the damper pedal to see if any dampers hang up. 9.  Set the dag block plates. Loosen the screws on the dag block plates.  Put the bare frame in the piano and insert the cheek blocks.  Slide the dag block plates back until they touch the back of the dag blocks and then tighten their screws to secure their positions.  These two plates will hold the action to the bed of the piano when the piano is on its side during shipping.  They also will locate the action in the piano front to back.  This is useful during voicing of the hammers when the action must be pulled out of the piano for needling and put back in the piano for testing.  Since the action will be in the proper position front to back, there is no need to repeatedly install the cheek blocks. 10. Checking the after touch. Put the keys and action stack back on the frame and place the action in the piano.  The keys should have about .410" of dip giving a nice after touch.  Small adjustments can be make to the dip by adjusting the glide bolts in the balance rail using needle nose pliers from the bottom of the frame. 11. Setting the damper lifter height. On the back of the keys the height of the damper lifter can be adjusted by adding to or removing washers from under the damper lifter.  The extra washers are stored on top of the damper lifter.  The screw is designed to hold the damper lifter, 6 height adjusting washers, a small steel washer, and a lock washer.  The key's damper lifter should raise the damper to the same height as the damper pedal so to determine if the damper lifter needs to be raised or lowered make the following tests.  Press the damper pedal to raise all the dampers and then press a key.  If the key raises its damper an additional amount then the damper lifter is too high and needs to be lowered by moving one or more of the washers from under the damper lifter to the top.  Likewise, first press a key and then press the damper pedal.  If the pedal raises the damper an additional amount then the damper lifter is too low and needs to be raised by moving one or more of the washers from the top of the damper lifter to the bottom. 12. Setting the hammers. Adjust the hammers under the strings using traditional methods. 13.  Finishing up. With a wrench, set the key frame shift screw as desired.  Different size filler blocks have been provided.  Attach to the frame the largest blocks that will comfortable fit in the gap at the bss and treble ends of the frame.  Replace the key stop rail. From Steinbuhler and Co 11810 North Perry Road Titusville, PA  16354