(Home) Whistling electric front sun roof

Can anyone suggest how you stop a whistling sun roof (no funnies please). The moon roof is fine but the front one whisltes like mad at speed.
Someone suggested to me that I add spacers but where are these things supposed to go and what are they (please don't tell me they are washers). Also how does the sun roof come apart if I need to adjust these.
Perhaps someone knows of a wind deflector for the front of a townace? - (#684) Russ, 28 Jul 01