Need help with norton frame

I am planning on having a support bar welded onto the frame of my norton. i am planning on having it attached on the two main down tubes, where would be the best precise spot for this? pics would be nice too. thanks
Bulldozer

For what purpose?

Most put tube about half way to about even divide tubes.
I put one 8.5" up from front iso mount tab, going by
universal structure wisdom that applies to everything
else but an isolastic Commando.

Stick a screw driver though naked mount tab and lever
on it a bit - let that torsion sense sink in for whats
happening on leaned powered road loads applied
by lever from rear patch to front mount >>>

I'd now put it closer to the mount tabs with more
tube twist resistance in mind rather than tube length
flex.

Mild steel thin 1/2" OD tube is what I had weld shop
do up. Also added one down at rear frame bend bottom.


hobot