TV Sony KV-21FS140 - Chassis BX1S Monitor specs

[Mahrio]

First of all, thanks for all (rCadegaming and others) the info while i was a anonymous reader.
I lurked in the forums a while before starting put my hands in a rotating cabinet project, with Hyperspin frontend, to run GroovyUME and some other 640x480 games. 

After build some parts of the cabinet and the CP, i got a Sony Wega Trinitron KV-21FS140 with a BX1S Chassis (I think its a Brazilian model).
I am using the TC-1600 transcoder to use the video component from my PC videocard, a ATI HD4870.
I did some good progress to adjust the geometry  but i still have some issues.

I want to adjust the 640x480 vertical geometry (i can do that with the service menu but i comprimise some other resolutions) and fix a issue on the right border of the TV.
You can check the progress and some pictures in http://forum.arcadecontrols.com/index.php/topic,132531.0.html. 

Can you guys point me some directions to find the right monitor frequency range?

Thanks for the help and sorry my broken english.

Mahrio