Now you can install an Adams Rite 4550 MS deadbolt lever in an existing cutout and be right on the money with no binding!  To add a 4550 lever to an existing lock, simply remove the inside cylinder or t-turn and replace with a HIT-22 drill guide (supplied) and slide the HIT-40AR7 over the top of the locating pin.  The four mounting holes and indicator are located with hardened drill bushings.  Just drill all holes with a #21 drill, tap the four corner holes 10-32, re-drill the indicator holes to 7/8" and install!