bunch of butchers
use a larger bit or just get a piece of plywood, 2"*15", drill mounting holes for your router on one end, measure the correct radius and drill your pivot hole on the other end. Put the pivot rod in and there ya go
because the SX is an SE with a XXX voice coil and some other parts from the XXX. So they called it the SE/XXX (SEXXX) for a while, then when they started massing them (TeamPSI built mine) they just called them SX's.