The usual method for using pushrods of fixed length, is to install the bell crank before gluing the horizontal stab in place. Then you install the control horn on the elevator with the holes for the pushrod centered on the hinge line. You attach the pushrod at both ends, and slide the stab back and forth until the levator is level, then mark the position, and then glue the stab in place. I think thi is spelled out in the Banshee instruction sheet. If there is a minor deflection after glueing, and it's in the correct direction, you can tweak the pushrod by bending it a bit to shorten it. Another old school method if using music wire push rods is to make it in two pieces with about an inch and a half over lap. Wrap the over lap tightly with thin un-varnished copper wire until it is sort of stiff and will hold a position. If the stab is glued on already, shorten or lengthen the push rod as necessary at the over lapped section and test the controls. When all is well and good, just solder the joint securely. And with any method, don't forget to install a fair lead to limit flex in the push rod. About half the airplanes hanging in my garage have push rods made in one of these methods with no problems.
Type at you later,
Dan Mcentee