The early cowl vents have a spring inside them that helps keep everything tight open or closed. The later vent mid-49 on does not have this spring. On the early version like yours you will notice inside on the cowl it has a plate installed around the handle later versions eliminate this plate and have a detent that the handle locks into. I am parting an early 49 right now (6SWL 1100) that has these items I will shoot some pictures.
Last edited by Brad Allen; 01/20/2010 7:52 PM.
