<HTML> Hello Stephane;    I have been fascinated with the " linked " action principal for years.  The thought that everything would move at the same time and the same force seems to me should work. Then why don't  it.   It seems that Clarence Hickmann was close mainly because  positive regulation points were in place. It,s to bad that the recession stopped work on it. I have been trying to find a Hickmann model to copy and give to the PTG Foundation.   The Schwander you speak of in my mind is not a true linked action.  It is linked to the hammer shank but not the key.  And this presents a  problem of regulation and as John Delacour says excessive wear.  The sliding escapement is not the best method of escapement either.  The 1860 Steinway double excapement action had the same type of escapement and I think the same problems of regulation. As far as regulating this action I think we would have to use key depth to the best advantage along with letoff for the best feel and check the hammer close to the wire.  The are my thoughts only, as I have never regulated a " linked " Schwander.  Good Lubrication would be necessary also.  Regards,   Jack Wyatt</HTML>