Roll a stump or rolling pin over the sharp edge on the front and back
Then gently tap the front edge with the mallet
I use two mallets, first use a flat mallet then I use a rounded mallet and surprisingly it's like the flat mallet didn't actually do anything!!!
Get a more rounded edge mallet but don't hit it too hard or you will get some compression cracks.
You can really smack the round mallet after using the round mallet and then go back to the round and hit it a bit harder until the rounded mallet doesn't make any marks.
Takes hours but your bat will be the envy of anyone that taps up with it