The adapter shown in Chopper's post is for shaft mounting if you use this option you will need to come up with a mounting bracket which is thin enough to fit between the adapter and the front of the motor. The motor mount that came with my Alpha 370 is shown in this photo
http://picasaweb.google.com/freefl2/20100105#5423340684793787538 works well. You will then be able to use that prop adapter shown in Choppers post. This is a good solution, but pay attention to when and how you mount the motor, as access to the motor and airflow to the motor needs to be taken into consideration.
You can also cut a plywood mount (I use 2-3" hole saws and make my own out of 1/16" or 1/8" plywood then drill mounting holes and use M3 bolts mount the motor to the board, and install the prop adapter.
http://picasaweb.google.com/freefl2/20100105#5423343405012508530The next option is the Housing mounted prop adapter
http://picasaweb.google.com/freefl2/20100105#5423340682898906626 which also came with the Alpha 370 motor I ordered from Hobby Partz, this mounts to the "can" of the motor and allows you to mount the motor using the same motor mount on the other end of the motor. I prefer this method as it allows me to make smaller fuse on the scratch built foamies because the motor remains in front of the firewall. It also keeps the motor in direct line of the airflow for cooler running. It can still be hidden by a cowl if doing scale aircraft. You can cut the motor shaft off (go slow and don't get the shaft too hot using a dremel tool with cut-off wheel) or leave the shaft on the motor and allow for the clearence of that shaft sticking out.
There is also the option of a prop saver, the motor shaft diameter is 3.175 or you can use cut the shaft of the housing mounted prop adapter that came with the motor and buy the appropriate sized prop saver.
Hope this helps.
