Hello everyone,
Well, I broke my holster for my Blackberry 8830 last night while jumping out of my car to try and avoid the 8" of water that collected in my parking space (I failed). I now have a replacement holster on the way, so I decided to dismantle my broken one, lay it out, and trace it to make a pattern, so here it is in case anyone wants it:
Blackberry 8830 Holster Pattern
For your reference, the circles with the M's inside indicate where the magnets were for the closure flap. You will also want to put a groove down the center of the inside to leave room for the rollerball, otherwise it will get smashed and damaged over time. The side flaps are elastic on the original holster, but I don't think that is really necessary. Also, if you want to get really fancy, you can put one of those thin little watch-battery-sized stainless steel magnets (they usually come with cheap magnetic bulletin board strips, like from IKEA) at the very bottom of the back of the holster, and that will tell the Blackberry to go into holster-mode.
~Noah