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Ok....that worked in getting apart very well. How did you get the throttle assembly to stay put? Just friction?
Unless you are going the Concourse correct route, you could upgrade the whole thing and use separate units . The Detomaso era Lego switches did well given how low budget they were built, but starting/ kill switch and throttle are safety and reliability items so with that in mind , here are some new available items for the job. That way you will have a new switch as well as a metal dual throttlehttps://www.mgcycle.com/index.php?main_page=product_info&cPath=131&products_id=739https://www.mgcycle.com/index.php?main_page=product_info&cPath=37_140&products_id=4898