<HTML>Hi all, A couple of days ago, I had to replace a whippen in a grand piano that h= as a Renner action.  I installed it and regulated it--except for the po= sition of the jack under the knuckle.  Try as I might, I could not get = my regulating tool between the let-off dowels.  I tried from every posi= tion and angle, but I could not get the thing in there to turn the button. &= nbsp; I checked the RennerUSA website, and they sell a tool for regulating jac= ks and rep lever height, but the blade does not seem small enough to fit bet= ween the dowels.  Hard to tell from the picture, though.  Does any= one have experience using this tool with this action?   Much thanks in advance Dave Stahl</HTML>