I can"t install a new V-Belt on my trimmer. I can't get the belt over the center pulleys as there is not enough slack. Handle is pulled down in the disengage position. belt goes on front and rear pulley wheels, but there is no slack to place it properly on #6 (166042) Pulley, Idler, V-Groove and #9(166043) Pulley, Idler, Flat.... Any help is much appreciated. Picture of assembly is on page 4 of the owners manual. I do have the proper belt replacement (Part # 185476 V-Belt). Thanks :-) GWF