If I were you I'd get an SSV wand/bowl. It's $16, has a little color in it, fits the VB (and others), and screen changing is a snap. I've struggled with screen changing myself, and the SSV wand is really easy to deal with. They even have a little video on their site, showing how it's done. One warning though-since all their glass is hand made, you can get a wand that's a hair too wide and the screen ends up being a little loose. but if you get one where the screen isn't tight when it's seated, they'll exchange it for you and probably refund your shipping too. There are some two piece whips available too, but you'll need to make sure they fit the VB, and screwing and unscrewing a whip with every bowl is a big pain. The two piece jobs are expensive too. The SSV bowl is an outstanding deal for $16.

silversurfervap.com/silverwands.htm