hmmm. Could you use a tube with the holes drilled into it, seal it at both ends, and feed the water in the middle? So get a T shape, stick a peice of tube with two or three hole in on either side of the T? Then run it on the top of the brush. If the holes were small enough, they should all get a good flow. Would it work?
If it did then no jets would be made as such, just holes in the pipe.