Rip fence knob orientation: Horizontal or angled down
Rip fence lock style for angled knob: plain thread end or wedge tipped
Extension table bracket slot: E-5" or ER-4" or ER-6"
Saw guard: sloted or solid
Wedge locks: one piece or two piece
You can tell without removing the locks by the size of the hole
on the rear side of the headstock. Large hole indicates two piece, small
hole indicates one piece.
Pivot base footprint: round end or squared off
Headrest bolt pattern: one bolt on each side or two on each side
