The 36 Flatslides do have a needle as well, and, as far as I know, they have the eclips with 5 slots. To lean them out, simply move the clip to the next higher slot, which reduces the needle height, which leans them out. Just move one at a time, and make sure that all three are the same.
On my ZRT 800, the clip placement makes a huge difference. When it is warmer out, it tends to run fat, and moving the clip up one notch, cleans it right up. In the really cold stuff, run it rich.
brownsleisureworld is a good microfiche reference.