Hi Jim and others..... as it happens I guessed the sizes.. ish and I had some green Toko 5.5T formers.. only 4 sadly..so I made some formers at 6mm and wound with 20 swg but I couldnt thread the centres as I dont have any taps of that thread.. UNF I guess.. so I used poly spaced trimmers for adjustment.
I am working on the 2 metre filter at present and I am nearly there..what with coupling distance,, tuning and coupling, its like spinning plates.. trying to keep them all in the air.
I am looking at the Coilcraft data, and I think I will pre test with home made formers and then order from them.. as in RAPID supplies.
Good job this project has no time limit..