Had this prob on the hybrid.
Mainly it was the front tube that went from sterring box to axle, but the logic is the same.
I tried a few homers 1st.
One was to sdrill a couple of holes around the tube into the cavity, then I pushed (read gentle tap in or in technical speak a JWhite No 18 Hammer) a piece of rod, 16mm from memory, then welded it in place, it helped but still bent.
Then I did the above and welded a lump of angle to it, same, bent again.
Then I bought a new pair of bars, and Danbars (sump are about the same) due to the OD and the joint wall thickness, I gave it terrible abuse (at least .78 on the Tonk abuserufar%se Scale) and never bent it.
I did manage to shear off a track rod, but fixed it in the mud, as such I still have danbars, but carry a std bar zippied to the roll cage "just in case"
By them Tonk there worth the money, you also probably need a new bat roo, cos the ID of the danbar is SOOOOO close ANY bend at all in the tube going into it and forget it it won't go on - work out how I know this fact
Nige