I had never installed a Model T radiator. After reading many many forum posts I did find a few that made the job so much easier. From the first picture I took as advised a large flat washer, then tightened the top castle nut tight. I put a stack of pennies under the foot of the radiator mount, then released top castle nut. When before I had only one thread above the spring (without the radiator or shell) now I had plenty of room ! Thanks