Busy day on my Ollie,
First: If you fixed your battery box support by yourself, you are a stud and have more patience than me.
My buddy came over to lend a hand and it saved me at least 45 minutes and several choice words, I'm sure.
It's fixed and is now WAY better than it ever was - since it only had a single bolt and no nut for.... who knows how long - likely years.
We also used a bottle jack and some 1" wood planks underneath the jack to support it. I did NOT want to crack the grey tank - major concern. But thankfully nearly all the weight held by the jack was where the support bar was also sitting.
We used a C-Clamp to straighten up the two bars a bit, not perfectly, but where I felt comfortable.
Drilled a new hole and added the same bolt as the original, I actually had in the garage. I was ready with larger stainless steel bolts and nuts, but ended up not using in the end.
Used lock tight on both and cranked down on stuff. Also have lock washers and flat washers where appropriate.
I will mark the nuts with a metal marker and keep an eye on them.
No more internal axle brake wires.
Also found the issue with my brakes - thread updated here: