I bougt my spinner from the same place I order the Magnum.
I pay around $10.oo Ask the same place were you bought your Magnum. The Spinner come with the spinner adapter
Make sure to balance the spinner.... Check this tread
http://www.rcuniverse.com/showthrea...475&forumid=162
Maverick, I dont know the shaft size on the engine. But call the hobby shop were you bought the Magnum.......I am pretty sure they have the one that is intended for the Magnum.
I get my from
http://www.modellbau-usa.com/
You can call them or write a e-mail to Mr. CAMILO CARRIZOSA
[email protected]
Good luck,
Isaac