The hammering is pretty straight forward. I used a two pound hammer striking a short length of 1/2" galvanized pipe. The first bearing took 8 or 10 blows, the second only five or six. You are striking the bolt, not the bearing itself. As such, its driven straight out and you don't have to fuss with inside spacer, trying to shift it enough to get a punch or drift on the edge of the bearing.