Problem Is it possible to mod a CRT to create a width control at the front of a cab?

Darren

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My set up is a Pandora DX Saga Plus, modded with a VGA to Jamma jumper to give the proper sync timing (Was impossible before to maintain a consistent position) hooked up to a Hantarex 900e. After much tinkering to get the width right on the width coil (For some reason the ferrite core was almost completely out), I have the width perfect for the 384x224 output.
However, Pandoras by default stretch each game from the real resolution such as 256x224 to 384x224 resulting in fuzzy and distorted pixels. I can force the width and height to the real resolution through XML settings and config files, works on square pixels, however this ends up far from the 4:3 resolution to 8:7, nice and sharp, but every thin.
As the ferrite core is a bind to adjust, and to be honest, I think its stuck were it is now, I want to be able to control the width from the front of the cab with a potentiometer (Or a rotary switch to jump to preset widths), so that each game can have the width forced by the xml settings, but then stretched by hardware adjust to none square pixels to maintain sharpness.
Some solutions I have seen have a Jamma intermediate connection, but they seem to only affect position. Would this be possible and how?
 
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