This is the top of the mace, called the Dome. When learning moves and spins, people will say for example thumb should point to the dome.
Likewise in other moves, people will say thumbs must point to the tip. this is the bottom of the mace.
The Balance point is where the mace will balance between the dome and the tip. Once you have located you balance point make it with a contrasting tape. Knowing where the balance point is with aid you in learning how to spin the mace.
e over the d clips on your mace, this will stop you from catching your fingers on them, whilst practicing.