tube in

Witch mold do you prefer and why? 1) Mold with the stopper inside and you place the tube onto the stopper 2) open end mold and you place your own stopper in from outside

I have been working on some tube in castings with alumilite and carbon fiber. I am so close to having it right, but frustrating myself reading all of the threads. I thought I would ask directly. I am painting tubes black, allowing ample dry time (days) then adhering CF to tube using method...