<HTML>Hi list, I went to a Youg Chang today,about 10 years old,for a tuning.I tuned it once about 3 or 4 years ago.I got there and every hammer was blocking,I'm not talking about buzzing,but major blocking.I did'nt have enough time to get into it as I had an appointment conflict.So I'm going back tomorrow to fix this ,pitch raise ,clean,and tune.(it's a grand with a piano-disc system).I checked to see if any rails were loose,or might have shifted,is there anything I should look for,maybe with the player system?I changed letoff on a few notes,and it quit blocking,but I sure had to twist them a mile,it has the dowel type.It also has excessive keydip.I guess I should go through one note and completely regulate,I am just checking to see if  there's something obvious,maybe I've overlooked. Thanks in advance, Hazen Bannister</HTML>