Here's a photo of the DeWalt dust collection system at work in the basement. Note, I didn't do anything to 'clean' the endcap before taking this picture. This is how clean the surface is when using the 621 hooked to a big shop vac. The duct tape 'dam' was put on since the plastic collar must be removed with using a wide bit. This is a pic after a 3/4" plunge cut to rebase a driver Link Removed