Don't know if this is exactly what you are getting at, but I'm using two barrier strips (part # 274-670) with some jumper strips (part 274-650) from Radio Scrap. They are a couple of bucks a piece and allow me to run the + to one of the sets of terminals (leaving 7 more screw downs) and the - to the second set of terminals (again 7 additional screw downs). I'm pretty sure this is overkill, but I thought it might make troubleshooting easier.
Basically, the barrier strip I picked up is a block of 16 screw down terminals in rows of 2 (each connected) that are seperated by plastic barriers - forming 8 usable rows. The jumper strip jumps accross each row, connecting them. This allows you to share a connection with seperate screw downs.
Does the explanation make any sense?
Try this lousy diagram of a barrier strip.
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| X | X | X | X | X | X | X | X |
| X | X | X | X | X | X | X | X |
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Or go to this site to see one:
http://www.oz.net/~coilgun/mark3/barrierstrips.htmGood luck!