The drain wire is intimate enough with the foil that you do not need to try to twist them together or otherwise connect them. The drain wire is for terminations to the shield. I built an early Seduction and don't remember if the original drain wire that was used had a stranded, rather than solid, shield. If it did then twisting makes sense. A stranded drain wire might need a little tightening before attaching.
Thank for your input. As of now I am pretty much cutting the Tin from the drain wire