Just to clarify, ADVERTISING or SOLICITING for a competing site is against the rules. Posting a link with information pertinent to a question is OK, even if it does send you to a competing site. In other words, you can say, "Here is a link to the answer at www.competingrcsite.com," but not, "Go to www.competingrcsite.com."

This is like the third time in recent history that I've run into this exact question for this exact motor. That's gotta mean something.

The motor can be mounted two ways:
1. Prop attached to the spinning can end of the motor. Motor secured to the front of the firewall, like a glow engine, via the metal "X," which is screwed to the stationary end of the motor. The collar is secured to the shaft protruding from the stationary end of the motor, tight up against the bearing and circlip to prevent the motor from pulling apart from the thrust.
2. Prop attached to the shaft protruding from the stationary end of the motor. Motor secured inside the plane, BEHIND the firewall, and protruding through holes in the firewall. Hacker includes a pre-drilled firewall as a courtesy.