Hi all,
Powerwerx is a good place to get them. You can also buy them from westmountainradio.com.
Get the crimper, it works well.
As far as the little hole goes, one can put a metal pin in there to keep the 2 halves from sliding apart, but most people don't recommend it. If the pin falls out it can short things out and that is, well, BAD.
If you want to put something in there you can use a toothpick, or just do what I do. Since you always want the red and black to be a pair, and in the same order, just put a drop of super glue on the little dovetail channel, and quickly slide them together. They will never come apart unless you have much bigger problems. lol
This site,
http://www.qsl.net/w2vtm/powerpole.html, has a great picture of how to do it, just DONT put the metal pin in like they show.
We just put them on the Jag's as a pig tail and on the motor as a pig tail and then plug them together. It makes it great to be able to remove your whole electrical board with 4 screws and 5 connectors.
Great for taking it off while the mech team gets metal filings all over everything drilling holes and what not.
Take a look at the 2 places mentioned if you want to mount them in a bracket, they have them.
Good luck
Mike