Hi,If you don't have a bump in the middle...... it's easy to wrap an elastic band around it a few times. Keeps the fingers in place.
I've always known them to be tippers, beaters, or sticks.
And of course you don't necessarily need one at all... you can play with your hand.
(This is all starting to sound like a bad "Carry on" script.)
Slainte
Alison