Yes the bar, which is so heavy I think it must be made out of depleated uranium or something supports the back of the bevel box in fact the bevel box clunks right down onto the frame when you remove the bar. Its a buggger to get back in!

kirkusblog.com
2016 M3W John A Prestwich Special
1952 Ford 8N
1968 Honda CL175,and 2018 Ural Retro