just dont cut it in any method that requires 'cooling'
if it doesnt get hot, no need to cool it.
soooo hacksaw anybody?
i know on my s-series fron coils (should be very similar)
the ends of the coils sit in rubber 'seats' which would make it very hard to know if i was cutting exactly half a coil or not.
not to mention, if F bodies are as similar to s-series as i have heard, you wanna have the cut end on top, which would make it even harder to cut correctly (hard to stick head up there into the spring pocket)