The two dimples are to dismantle the freewheel, not to remove it, unless someone has fitted an old freewheel that has the castellated slots for the two-dogged removal tool. To remove a normal freewheel, you need the normal splined tool, but you need one with a large hole all the way through it to clear the axle. If you have a 14mm axle, you'll need something like the DNP freewheel removal tool.