sparkleball.com
The Perfect Hole - Make-a-Sparkleball
I’ve given Carl Boro a lot of credit on this site, and no wonder. If anyone knows about building sparkleballs, it’s Carl. Probably his very best tip is the 1/2″ step drill bit. Carl uses the bit in a drill press. (video here) I use mine in a hand drill. The bit costs about $14, but it makes absolutely perfect holes. Lights …