a deft hand with a dremel type tool should work, with having the ballast clamped in a stationary position, to remove the unneeded ballast. but remember, the duel ballast has two different values, but i can't remember off hand what the resistances are. that is why there are locating pins on the plugs, to index the ballast slot. pick the side with the resistance you need, then gut the other side. hope this makes sense.