I am converting the 3 tanks over to stainless steel parts and stainless steel hardware, this is the hardest part of the whole job. Priced out all the manifolds and when I need to I sacrifice the cheapest one. Have 90% of the bolts out from the one tank so far. I am using an air hammer with a point and once u get them to move the go easy, but to get them to move. Replacing with 1/4 inch by 8 inch 316 stainless carriage bolt.
We ended up grinding the carriage heads off the bolts then we would slice the side of the manifolds along where the bolts run with a hacksaw or zip disk. We were able to reuse all of the manifolds and now in the future if we need to take it apart again it will be a quick easy job. If you go look at the new 1910 carts they are now molded so that the bolts are no longer enclosed.
I am confused to why those 6x190 bolts would ever need to be removed. I have replaced all my meter boxes with stainless and have never had to split the plastic manifolds apart. Or is there something to service within the manifolds?
On ours the steel plate had rusted so bad that it was binding on the double shoot slide selector so we had to take it apart to clean all the rust out and repaint. If I'd had more time and money I would have replaced everything with stainless but considering that it went 12 years without having to be taken apart it probably won't be around long enough that I will have to do it again.