I did use 1/4" soft copper..
The problem was I had to solder 1/4" copper to 1/4" copper lol.. So I used a piece of 3/8" copper.. slipped it over..
This time I need to make sure all of my surfaces are clean in and out before I go and solder..
This time I work it's the professional time.. not the sloppy shady mechanic work I've been doing.
If you are getting my drift.. I am trying to make a "marketable" unit..