Contact points is where you change the input in the Aircraft CFG. Just read the CFG it tells you what values need to be to be recognized. This is from the 206 CFG. If your modelling in Gmax use an unconverted box to measure out your contact points. Take alook at this thread. The 3 is the contact point type and should not have the (----) just for direction
http://www.simviation.com/cgi-bin/yabb2/YaBB.pl?num=1186621489 //0 Class <0=none,1=wheel, 2=scrape, 3=skid>
//1 Longitudinal Position (feet)
//2 Lateral Position (feet)
//3 Vertical Position (feet)
//4 Impact Damage Threshold (Feet Per Minute)
//5 Brake Map (0=None, 1=Left, 2=Right)
//6 Wheel Radius (feet)
//7 Steer Angle (degrees)
//8 Static Compression (feet) (0 if rigid)
//9 Max/Static Compression Ratio
//10 Damping Ratio (0=Undamped, 1=Critically Damped)
//11 Extension Time (seconds)
//12 Retraction Time (seconds)
//13 Sound Type
//14 Airspeed limit for retraction (KIAS)
//15 Airspeed that gear gets damage at (KIAS)
[contact_points]
point.0=(---3---), 4.83, 3.33, -4.50, 1574.8, 0, 0.5187, 0.0, 0.286975, 2.5, 0.605067, 0.0, 0.0, 7.0, 0.0, 0.0
point.1=3, -3.50, -3.33, -4.58, 1574.8, 0, 0.5187, 0.0, 0.396299, 2.5, 0.728164, 0.0, 0.0, 7.0, 0.0, 0.0
point.2=3, -3.50, 3.33, -4.58, 1574.8, 0, 0.5187, 0.0, 0.396299, 2.5, 0.728164, 0.0, 0.0, 7.0, 0.0, 0.0
point.3=3, 4.83, -3.33, -4.50, 1574.8, 0, 0.5187, 0.0, 0.286975, 2.5, 0.605067, 0.0, 0.0, 7.0, 0.0, 0.0
point.4=2, 0.00, -16.67, 9.00, 0.0, 0, 0.0000, 0.0, 0.000000, 0.0, 0.000000, 0.0, 0.0, 5.0, 0.0, 0.0
point.5=2, 0.00, 16.67, 9.00, 0.0, 0, 0.0000, 0.0, 0.000000, 0.0, 0.000000, 0.0, 0.0, 6.0, 0.0, 0.0
point.6=2, -20.50, 0.00, 1.67, 787.4, 0, 0.0000, 0.0, 0.000000, 0.0, 0.000000, 0.0, 0.0, 9.0, 0.0, 0.0
point.7=2, 0.00, 9.08, 2.58, 787.4, 0, 0.0000, 0.0, 0.000000, 0.0, 0.000000, 0.0, 0.0, 4.0, 0.0, 0.0