Recently I changed the standard dual control to a single control lever. Everything went fine except I can no longer stop the engine. Previously the engine was stopped by pulling way back, with some effort, on the throttle. With a single control I can not pull back on the throttle without putting it in reverse. I purchased and installed a Lever Assembly Stop (Universal Part Number 300035). It does not seem to connect to anything. I am desparately looking for some knowledgeable input. Thank You.