Jacko had them dropped through on a killswitch, his problem was not putting a flat washer between the baseplate and the bushing. He initially let the bushing overhang the baseplate creating a sag at the end of the turn. this is not so bad on the roadside bushing but on the baseplate it will take to energy out of the bushing, it needs to have a perfect pinch. Whether one has it dropthrough or topmount is all just a bit of personal preference. I did this same setup for McWinnie (killswitch dropped with kahas) before he went to Peru and he thought it was the best board he'd ever ridden.