<html> <body> Keith, I worked on one of those years ago - my sister ended up buying it. This action (from Wessel, Nicklel and Gross, I believe, but I've only seen it on Mason & Hamlin)  repeats amazingly well.  The only real drawbacks are a little extra force in the key when the hammers are in check, the possibility of bobbling hammers if the springs are set too strong or the aftertouch is too great, and when they are working right a very soft blow will push the hammers forward against the strings, preventing 'ghosting' the notes.  Once the action was regulated well I never had a problem with bobbling, but a piano teacher noticed that when he played the notes silently, the hammers would block the strings spoiling a demonstration of harmonics he was trying to do for my niece. On the action I worked on the springs were very consistent, but the felts were worn out.  I replaced the felts with thin butt felts (if I remember correctly!), matching the apparent thickness of the originals.  The amount of aftertouch in the action has a huge affect on the springs, and I found minimal aftertouch was best.  If the springs are unevenly bent on the jacks, try to gently flex them to make a straight line when viewed from the end of the action.  I don't know exact measurements - as I recall, the one I did had about 1/4" gap between the top of the spring and the jack - but I haven't seen it in a long time, so I could be remembering wrong. A very affective design, in my opinion. Don Mannino At 11:08 PM 3/6/2004, you wrote: <blockquote type=cite class=cite cite>I'm working on one of those  M&H uprights with those flat brass springs between the jack and the hammer butt catcher. Is there an adjustment for those? Some of them may have been bent out of shape on the reset when the bridle straps were off. Most of the hammers show a wink at letoff but some don't making it tough to determine the exact point of letoff. Also the hammers want to check at 3/8 inch. Would that be the normal setting? Thanks Keith Roberts</blockquote></body> </html>