I'm just about to fit balance weights on a loco. I've got a photo of the right hand side of the prototype. The coupling rod pin is at 12 oclock. The balance weight is at 3 oclock. I know the crank pin is at 6 oclock. Where does the left hand weight go relative to the left hand crank pin? MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.