DULUTH, MN (KDAL) - A crew from Iron Workers Local 512 and Lakehead Sign will be donating their time to help bring down the "tree" erected last November as the centerpiece for the Bentleyville Tour of Lights.  The dismantling of the structure will begin at 8 a-m Saturday and will take 5 to 6 hours to complete.  The tree is then stored for the off season at lot "D" on the waterfront.  Volunteers will also be taking down the remaining displays at Bentleyville and extra help Saturday from 8:30 a-m to 4 p-m would be appreciated.