I've played tennis since 1958 and until today have never seen a metal racket press.
Were they not popular in the US?
As a boy I had hand me down wooden presses with springs and thumb screws. God forbid that our rackets should warp!
Of course the better players never took their presses to the courts. If somebody arrived at the (public) courts with their racket in a press, you knew they were beginners and to be avoided.
Beginners also wore BLACK SOCKS and other NON-WHITE outfits. How times have changed!
Volkl Organix V1 Pro, Babolat 17 gauge natural gut at 50