Harvesting the 3mm EDF fan adapter from old J-power EDF

The stock motor rated at 250W and has to be replaced by current powerful >520W BL. I have to "harvest" the pressed fit adapter from the old motor. This is a very difficult procedure without the right tool. I use 2 piece of 5mm shaft (from Trex 450) and a bearing remover to press against a 3mm steel screw inside the 4mm hole on the adapter.