Gillette old type head repair

[bill64]

I have three old types and although I love them,I'm not sure if they are straight.
I'm not refering to bent teeth but the way the razor seat .It seems that it bents outwards at the center of the head.It curve in the middle.The cap's corners are OK.What I can do?When I tried the lower plate with a Fatip top it was straight.

 

[ajkel64]

Any chance of some photos to show us what you are talking about?

 

[romsitsa]

Place the cap and comb on a piece of flat glass to check wher the problem actually is.