IF YOU LOOSEN UP THE PART AROUND THE DISTRIBUTOR, WIRING, MISTURE CONTROL, ETC. IT GIVES JUST ENOUGH ROOM TO REPLACE THE DISTRIBUTOR CAP AND ROTOR. IT IS NOT EASY AND YOU NEED TO CONTORT YOUR HANDS AND WRIST. IT REALLY HELPS TO GET WIRES THAT ARE CORRECT WITH 90° CAP INTO THE DISTRIBUTOR.