Read WNG manual carefully, draw a plan on the aluminum rail including mounting location, first flange screw hole, and first underlever screw hole. Take out the scale stick and tape on the main rail. 

Use the punch provided by WNG, triple check the position of the punching point, not to place it backwards. Point the single line mark on the punch to accurately located scale stick. Punch with a rubber mallet. 

The trimming stand is homemade by shop owner. The action stack is screwed down, then raised to an angle to be easily worked on. Use a clamp to fasten one section of hammer shanks so they won't move everywhere during trimming process. Lift this section with a block. Also protect hammer felt with tape or plastic wrap.

Before hanging the hammers, the shanks need to be traveled or make sure they rotate straight up and down without tilting to the left or right. The WNG composite shanks reflex light crazily. Marking the tips of shanks with a white sharpie helps seeing the irregularly moving ones. lift shanks up and down with a long rod and watch. If shank is traveling to the right, put a shim on the right side on bottom of flange, then check, vise versa. The shims here are cut from sticky labels.