Customize spacer size?

Hi there,

I've done customizing ObjectDock the way I want, but I've ran into an issue I can't seem to fix.

I'm using the animated quick launch dock. I've set the display to be on the left of the screen (vertical). I added a bunch of programs, and I want to separate them, so I'm using spacers. But the issue I have, is that they are too big. I want them to take up less space. Is it possible?

THanks