Hey guys! Made this earlier today, has removable socket as a bowl, fits snuggly in the slightly bigger socket, so works perfect! Rate my work!!
my guess is he used a diamond tipped drill bit wich are meant to cut throuugh glass...you can also submerge the bottle in water while you drill through to avoid cracks...a bit like this will run you about 15- 20 bucks
I made one too today l [ame=http://www.youtube.com/watch?v=pyYxlGC0wzk]YouTube - Homemade 4 arm perc- Snaps[/ame]