Mortal Kombat Vs Vsync

Hi,
    I'm running AdvanceMAME under Gentoo Linux, with an ArcadeVGA driving a
Hantarex 15khz monitor using svgalib.
    I have got most games looking great and vsynced beautifully. However, I 
am still finding it impossible to get the Mortal Kombat games to vsync. I 
know they have a weird 53Hz refresh rate. Still, I'm allowing advancemame to 
generate it's own modeline. My advmame.rc states my monitor's capabilities 
accurately (it's basically a PAL/SCART TV) and of course sets vsync = 1. 
From bash, I just type:

advmame mk

What I'm getting is a mode with precisely the correct resolution, but a 56Hz 
refresh rate, and no possible vsync (according to the 'Video' menu).
    Since I am using a standard res monitor and am allowing advancemame to 
generate its own "perfect" modeline - how come I can't get vsync?
    Am I missing something really obvious? I *think* playing MK with a 
"perfect" screen mode should be within the capabilities of my setup.

Thanks in advance for any help! 



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