The crosshead shoe bolts on the model show 4 bolts like a K-36 where as the drawing and the real thing (K-27) has five.THe piece directly behind where the front end of the the radius rod and the top of the combination lever come together on the real thing has a bolt pattern of three in a triangular shaped pattern and on the model it has a pattern of four in a parralellagram shape.It also appears on the drawing that there is a guide for the valve stem and it was not applied to the model and in photos it shows the piece behind the rear valve cover,the piece that comes directly off it and is on a 45 degree angle. (fingers crossed)