On the bench, the four tiny bolts holding the distributor cap to the Opti housing are more apparent. They use an unusual inverted Torx-style head, which most of us don't have a tool for. The techs at MSD claim the company'scap and rotor sets will include the required tool, but our test cap didn't. We used a trick we found on the Internet of using one of the throttle-body top plate screws as a socket. Wrap the screw in tape to protect the threads and then clamp it with a small vice grip. Now it can be used to remove the Opti's bolts. Note: The likelihood of the throttle-body screw's threads being damaged is high.