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You can do it with a standard crank puller and a length of something that will fit inside the axle and provide enough resistance.
Remove crank bolt from one side, insert thing (I have a length of threaded rod) so one end is against crank bolt, insert crank puller (standard one) into crank, then push against the end of the item inside the axle using the crank puller to remove the crank.
Are there any ghetto tools / techniques for removing Hollowgram cranks?