Shopsmith 10 E or ER Rip Fence Front Base Casting with Screw Knob (#3639). This is the type that uses the angled locking-screw knob, not the level locking-screw knob that some have. 2-7/8 ” wide x 3-3/16″ long x 1-1/2 tall. Good threads and bar groove. Bolt holes for the fence bar are 7/16″ dia …