msd optispark problems
You don't indicate what car you have, so your indexing method will be different if it's vented or unvented. Vented optis use a pin drive which engages a cloverleaf drive mechanism, the unvented uses a spline drive with a small key.
Also you should have done your research on the MSD optispark as it offers no appreciable benefit over the stocker in both reliability and features, especially at $100 MORE than an OEM.
non-vented opti keyway




