This dual magneto gear (LW13643) came off a Lycoming IO360A3B6D. The only reason that this has become available is that this engine is in my experimental RV8 and I switched to an all electronic ignition system. The engine did not suffer any trauma or sudden stoppage so the buyer can rest assured that the gear has not been stressed in any way. Spruce (part number 07-02013) lists this new at a crazy $1673.35!!! . I want the buyer to be satisfied and will accept returns if you're not satisfied, however the buyer will pay for return shipping. Please ask any questions you might have.