Wow, those can be kind of expensive- glad I borrowed them.
parts
The puller is $15-$30 and the press is $25 to $40 depending where you get them.
Search around, and you will be able to find them. The press is to get the gear on, and it does a beautiful job.
I'd love to get you a video, but I don't have a camera to do it. I can get a coupple of the digital pics tonight. but no action shots..
Oh well.
Battery life is pretty good, I haven't ran them out yet, so it's over 15 min. of slamming into the walls and furniture in a 20x15 living room.