A simple thing. A tall auxiallary rip fence. Been meaning to do this for years, now I am building a chest on chest dresser, and I have to cut a lot of grooves, dadoes & rabbets in some fairly large pieces. 9 & 1/2" tall, all MDF, no screws, just dadoes, rabbets & glue. Hardboard face with T-slot groove. Have to make a tall push block for raised panels, etc.