i made the baffle and what a difference, thanks for the advice.
i sanded about 3 - 20"x48" red oak boards and took about 1/32" off on my woodmaster sander, i checked the sawdust fallout on the doughnut after using the flappers. then made the baffle and then sanded another 1/32" off and this time there was about 1/2 as much sawdust on the doughnut...
maybe next week i will try the neutral vane to see if that will make another bid difference...
thanks
James
how can I find info to mod the Harbor Freight DC with the baffle?