<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body bgcolor="#ffffff" text="#000000"> Hi Paul. I'm guessing its not an option for you to personally go and make the necessary measurements. So fill me (us) in a bit here. Are the keys sent in by a tech or by the customer ? You cant ascertain the back end of the keys by old glue marks ? Why is that ? Have the  tops been removed and the wood pre-prepared for you or something like that ? Worst case is not a big problem me thinks.  That would be they are too long and need to be filed down after installation. But you could get whomever sent these to you to put the action back in with the fall board in place and simply measure out from the balance rail pins how far you need to be. You can only do so much from afar to assure proper fit yes ?  If you do what you can.... then the end responsibility for final fitting is the person what sent them to you. Just inform the person of the problem and take a positive "we'll figure this out" track... for a little extra fee then usual if it ends up causing you extra work. Cheers Richard Brekne <blockquote> <blockquote> A set of keys from a 1942 Steinway L arrived in the shop for new whites and sharps.  All the original tops are GONE!...that includes the sharps.  What I  an find to measure is 3 ½”.  I checked on a 1969 Steinway M and they measure 3 5/8”.  Ebony sharps from the vendors measure 3 ¾”.  Steinway  & Sons were not helpful.  Does anyone have an early 1940’s L handy to measure them for me?  My concern is the distance between the back of the sharp to the fall board.  All I have is the keys .Please!! Thank you to all. BTW. Thank you for your responses to my pin block question.  I’ll take the advice(s) to the piano and determine the best approach, then report back to you. Paul C</blockquote> </blockquote> </body> </html>