Hi David, Heathrow Services list a lockheed 3:1 servo for 99.99 GBP I think it would fit as a direct replacement. Maybe the others can confirm? http://cgi.ebay.co.uk/ws/eBayISAPI.dll?viewItem&item=160152417933&indexURL=0&photoDisplayType=2#ebayphotohosting Cheers, StevenD