this as simple as ugly design is how i mean to do the hold down
http://img515.imageshack.us/img515/3937/staffa28kp.jpg
http://img530.imageshack.us/img530/2621/118iu.jpg
http://img530.imageshack.us/img530/7576/220oq.jpg
as you can see
the plate is in pure alluminium and measures in millimeters 100 x 100 x 12
the bar is in steel inox and measures in mm 150 x 15 x 5
what do ya think about?;)