How do i get rid of space for custom pattern brush

[#1]

I'm exploring custom brushes in Illustrator (CS6) but cannot figure out how to get rid of the spaces in between my brush pattern. I have the brush stretched to fit and the spacing at 0% but there is still a tiny gap before each pattern repetition. I tried to make the spacing a negative % but you can't do that

[#2]

I'm exploring custom brushes in Illustrator (CS6) but cannot figure out how to get rid of the spaces in between my brush pattern. I have the brush stretched to fit and the spacing at 0% but there is still a tiny gap before each pattern repetition. I tried to make the spacing a negative % but you can't do that

[#3]

Please show

- the settings for the brush

- the base artwork