Hillbilly golf, golf ball drilling device

My grandson likes hillbilly golf and asked me to make him a set.
I needed a way to drill a hole through the center of a golf ball so I could tether
2 golf balls together.
I re-purposed a base,

Anycubic Kossel Linear Plus Golf Ball Foot by gartnix
http://www.thingiverse.com/thing:2767711

I also re-purposed a topper with a hole in the center,

Golf Ball Marker - Pokeball
https://www.thingiverse.com/thing:1728878

I needed a spacer to fit between the base and topper.
I designed this