Go with a drilled holed with nails.
Jason Perkins from Allagash shared his expertise with me on this one.
Stainless 1.5 inch 4 d nails. Use a 7/64 drill bit. It is important for the nail and bit size to be exact. We got the nails out of Mcmaster Carr, although I am sure you could get them from a hardware store.
Exhibit 'A' Brewing Co.
Framingham, MA USA
Filler of Vessels
Seller of Liquid
Barreled Beer Aging Specialist