I have a 1987 Renken with a 470. Just upgrade to a Pertronic Ignitor. When I put the magnet onto the shaft, it was seated as far down as possible. To me it seemed like the magnate did not leave enough room for the rotor to sit as far down as before. The engine started right up and died about one minute later when the rotor got caught on the inside of the cap. Has anyone had to modify their rotors to accommodate for the magnate? Or used a different rotor? Thanks.