I have a Quicksilver Commander 2000 controller. There is a button on the lower part of the handle that is square shaped and says "throttle only". I am assuming this is the button to push in so I can have the fast idle function when advancing the throttle level forward. However, it doesn't stay in and the function doesn't work. Is there a kit or a fix available to allow this to work. A part # would be very helpful. Would a Quicksilver MSC-4000 controller work better as it has the Fast idle lever instead? Thanks. jeff.