Terry Every set of knuckles I have ever purchased as a red (sometimes green) line placed at the base of the leather by the core that indicates the direction the knuckles should be glued. There is some discussion about which direction you should set the nap.... but there is no discussion about the need to be consistant. Hence the marker. Makes it just that quicker to install. As to the whole discussion about which direction is the <<right>> on.... grin... I'm not going there. Cheers RicB Leather has a "nap" direction. Stroke it one way and it is very smooth, stroke in the other direction and it is rough (or at least not as smooth). So the knuckles have a "nap" direction. You are correct that this direction is not indicated on replacement knuckles. Nor is grain direction indicated on a piece of wood from a lumber yard - yet in many applications grain direction is important. The professional is expected to be able to identify these characteristics and respond accordingly. Terry Farrell
This PTG archive page provided courtesy of Moy Piano Service, LLC