As title suggests, have just taken delivery of a Sheppach HS105. Everything seems ok with it, although the riving knife was in the 'up' position and I can't seem to push it back down to the 'transport' position. I raise the saw up full, unlock the knife but it will not go back down. So when I wind the blade fully down, the riving knife is still above the bed, which I need it to be. Any suggestions?.