The boots need to be notched with a file. But you're crazy to ski with this toe. It has no elasticity -' either in or out. Marker called "punctual release." To adjust forward pressure flip up the cover that the boot heel rests on. Then move the cable fore and aft. You'll know it's sort of correct when you can get the release index on the ends of the spring adjusters approximately in the middle of their tiny scribed indexes. This was one of the dumbest binding designs ever mass produced.
Seth, speaking of the Simplex DL toe (and Rotomat heel), I still vividly recall a full 'Competition' prep of this binding system in SKIING magazine in the later 70's.
First they placed a proper AFD under the ball of the foot. This of course raised the toe piece a substantial amount. The toe piece height adjustment is made by removing the small screw pin in the front and rotating the toe up or down to get the correct height, then replacing the pin. If unscrewed (raised) much the leverage would cause flex. So the would place a plastic shim under the base to get the elevation needed without the flex.
Then they would shape the outer wings of the toe piece where they would touch the shell of the boot when there was movement. By opening up this clearance a small amount to re centering was perhaps possible. This is a double pivot toe so this slightly changed the time it took for the ball to pop and open the toe piece.
In back, the Rotomat was set up with the BLACK springs (then available from
LOOK) and
the heel was mounted to keep the angle as steep as possible. This would maximize heel
hold down creating a solid ski/boot interface and also lesson the forward pressure to the toe piece which helped with minor re centering.
Also in play in those days was the mix and match of different brand heels and toes. Very popular were the Rotomat FD (turntable base) with the
LOOK Nevada toe. I also remember seeing some with the Salomon 502 toes. Until
LOOK came out with the RED Comp Grand Prix heels with the heavier spring many couldn't stay in them for racing. Washers were even used to add spring preload to try to stop popping out leaving the start house!