Step 1: Supplies
12 Battery Operated Tea Lights.
At my local Dollar Tree I found these plastic eye balls six to a package and led tea lights two to a package. You can also find some inexpensive super glue there.
Step 2: Tools
-1/16", 1/8",1/4" Drillbits
The opening I needed was 5/16" but I didn't have such a bit on hand so I used a 1/4" and slowly widened it a little. You might might need a different size depending on the size of the rubber flame (2) on your tea lights so 1/4" might be enough, measure twice, cut once.
Step 3: Drill
Step 4: Insert Light.
Step 5: Secure
NOTE: E6000 might be a bit much but was all I had on hand when I took the pictures.
Step 6: Repeat
I recommend drilling all the 1/16" holes first then the 1/8" and the 1/4" so you're not constantly changing bits.