I know that suggesting a person make an actual phone call is absurd in the year 2009, but, Hobby People is the retail arm of Global Hobby and they likely have the parts you need. Global Hobby is the US importer of Magnum engines.



Here is the info if you want to call them.

You can reach us at the following phone number: 1-714-963-0329 or fax to 714-964-6236. A customer service representative will be happy to assist you. The hours a live person can respond to your inquires are Monday thru Friday 9 a.m. - 3 p.m. Please note that these time are Pacific Time. During periods of high numbers of phone calls, the customer service personnel may not be able to answer your call 'live'. If you leave a message including your name and phone number with area code, your call will be returned as soon as possible - unfortunately, during busy times this could be several hours or more. It is helpful to ask your question or state the reason for the call in your message so the as much info as possible may be gathered before the return phone call is made.




Most likely this is the assembly you need and it is ten dollars
http://www.hobbypeople.net/gallery/281804.asp