[Repeater-Builder] DB Bp cans to BpBr for duplexers

[NORM KNAPP]

Hi fellas,
I need some input...
I have 11, yes 11 DB products Bp cans from various combiners. They are 8" in 
diameter and have the model #SP8145-VT1 or SP8145-VT2 on some of them. I want 
to "turn" them into BpBr cans in order to make duplexers out of them. I think I 
will need some of those little variable caps or is there another way? Where 
does one get those caps? I think they are made by johanson or something like 
that. 
Has anyone ever tried this?
Thanks!!!
73 de N5NPO
Norm