Bench bleeding help

I use the vehicles push rod to bench bleed a master cylinder in my vise. A piece of 2X4 about a foot long, wrapped in shop towels, held against my chest. Push rod against that. Left hand grabs back of the vise. Lean in and away to stoke it! Too easy. Power brake master cylinder is same except a long drift pin substitutes the push rod.
Master cylinder ports are going to dribble fluid, so by the time I get the line fittings tight any small air bubble in top of the line bled away. Check brake lamp switch adjustment. Done