Hi Shaz

There may be no hard points installed but you might be lucky, if not pull the aileron down so you can get inside, drill a hole in the balsa where your horn is located and inject Hysol into the aileron, this gives a firm footing for the horn.

I did a build thread here:
http://www.rcuniverse.com/forum/m_94...tm.htm#9401509

I also have all the build photos on my facebook page here:
https://www.facebook.com/media/set/?...3151924&type=3

I hope this helps.

Cheers, Alex