Copper/Aluminum split bolt (for copper to aluminum connections), scotch 33 wrapped on backwards (sticky side out), cambric, linerless rubber (or scotch pad), scotch 33 again (sticky side down this time), and a layer of friction tape is my formula for noncrimp connections. I use the same for gutters when I have to use split bolts. The backwards tape is used to make it easy on someone if they ever have to break those connections. HMEL#688
