
The first thing you should do is go to the Microsoft Fs2002 SDK website: Click the below link:
http://zone.msn.com/flightsim/FS02DevDeskSDK00.asp
And download the aircraft container SDK. This has a detailed explanation on contact points and how they work,this will also give you some insight. You can go to the planes's folder(In question) and look for the aircraft.cfg file. You can open this with a file editor, such as notepad and scroll down to the contact points section and edit the lines accordingly. You may want to experiment a little to see how they work
I have seen quite a few posts on this forum addressing this issue, which might also help you.
Hopefully, this helps a little, post again if you have any more questions.