01-05-2019, 10:59 AM
I have also assumed that the change in chassis cross members coincided with the AE body introduction, or at least around that time. I had a mid 1928 Chummy years ago with closed cross members and my current RK (Oct 1929, chassis 99000 and something) has the later type, so the change occured somewher between.
Regarding the straigtening, I'd look at trying to use some kind of press or straigtening device, someone suggested a rail straightener on my thread. I had to use replacement rails because the originals hade been extensively broken and then "butchered" back together with lots of heat. Try and keep heat away except where absolutely necessary as the chassis were apparently heat treated in the factory.
Regarding the straigtening, I'd look at trying to use some kind of press or straigtening device, someone suggested a rail straightener on my thread. I had to use replacement rails because the originals hade been extensively broken and then "butchered" back together with lots of heat. Try and keep heat away except where absolutely necessary as the chassis were apparently heat treated in the factory.