Hi all...!
This has been covered before by Roger, (Rollerball) some time ago.... 8)...!
(He even highlighted the numbers)... 8)...!
I even saved the details on my computer... ...!
But, as we all know, the dreaded computer crash wipes all this delightful information from our hard drives... ...!
So lets try it again... ...!
The detail necessary to alter in the Aircraft.cfg text file to move the contact points of the nose and main wheels.
Example:

[contact_points]
point.0=1,22.000000,0.000000,-6.916667,1600,0,0.57,75,0.267838,2.5,0.685009,0.00
0000,0.000000,0.000000,0.000000,0.000000
point.1=1,-1.083333,-7.25000,-5.916667,1600,1,0.57,0.,0.243469,2.5,0.718429,0.00
0000,0.000000,2.000000,0.000000,0.000000
point.2=1,-1.083333,7.250000,-5.916667,1600,2,0.57,0.,0.243469,2.5,0.718429,0.00
0000,0.000000,3.000000,0.000000,0.000000
point.3=2,0.000000,0.000000,0.083333,1574.803150,0.000000,0.000000,0.000000,0.00
0000,0.000000,0.000000,0.000000,0.000000,5.000000,0.000000,0.000000
point.4=2,0.000000,0.000000,0.083333,1574.803150,0.000000,0.000000,0.000000,0.00
0000,0.000000,0.000000,0.000000,0.000000,6.000000,0.000000,0.000000
static_pitch=1.994019
static_cg_height=5.907364

(In this example the nose wheel is buried in the ground up the the axle).
Which are all the numbers that require altering to raise/lower the nose and/or main wheels to contact the ground surface...?
And do the numbers need to be increased/decreased to raise/lower the wheels..?
Many thanks... 8)...!

Cheers all...!

Paul....(complicated..innit.. ...)...LOL...!

The actual aircraft can be seen here to illustrate the point...>>>

http://www.simviation.com/cgi-bin/yabb/YaBB.cgi?board=screen;action=display;num=...

[contact_points] section
You can configure and adjust the way aircraft reacts to different kinds of contact, including landing gear contact and articulation, braking, steering, and damage accrued through excessive speed.
You can also configure each contact point independently for each aircraft, and there is no limit to the number of points you can add. The data for configuring the points are placed in the [contact_points] section of the aircraft.cfg. When importing an aircraft that does not contain this set of data, the program will generate the data from the .air file the first time the aircraft is loaded, and then write it to the aircraft.cfg.
It may be useful to first look at the .cfg file of an existing aircraft; you can learn a lot from the many developer comments, which are followed by two slashes (//).
Each contact point contains a series of values that define the characteristics of the point, separated by commas. Each point's data set takes the form “point.n=”, where “n” is the index to the particular point, followed by the data.
Example:
[contact_points]
point.0= 1, -18.0, 0, -3.35, 3200, 0, 0.50,180, 0.25, 2.5, 0.90, 1.0, 4.0, 0, 0, 200
Below is a description of each element of the example contact point data set:

Parameter      Element      Description
1 (1)      Class      Integer defining the type of contact point:  0 = None, 1 = Wheel, 2 = Scrape, 3 = Skid, 4 = Float, 5 = Water Rudder
2 (-18.0)      Longitudinal Position      The longitudinal distance of the point from the defined reference datum (feet).  Positive is forward (out the nose).
3 (0)      Lateral Position      The lateral distance of the point from the defined reference datum (feet).  Positive is starboard (right, as viewed from the top with the airplane pointing “up”).
4 (-3.35)      Vertical Position      The vertical distance of the point from the defined reference datum (feet).  Positive is up.
5 (3200)      Impact Damage Threshold      The speed at which an impact with the ground can cause damage (feet/min).
6 (0)      Brake Map      Defines which brake input drives the brake (wheels only).  0 = None, 1 = Left Brake, 2 = Right Brake.1
7 (0.50)      Wheel Radius      Radius of the wheel (feet). 
8 (180)      Steering Angle      The maximum angle (positive and negative) that a wheel can pivot (degrees).
9 (0.25)      Static Compression      This is the distance a landing gear is compressed when the empty aircraft is at rest on the ground (feet).  This term defines the “strength” of the strut, where a smaller number will increase the “stiffness” of the strut.
10 (2.5)      Ratio of Maximum Compression to Static Compression      Ratio of the max dynamic compression available in the strut to the static value.  Can be useful in coordinating the “compression” of the strut when landing.
11 (0.90)      Damping Ratio      This ratio describes how well the ground reaction oscillations are damped.  A value of 1.0 is considered critically damped, meaning there will be little or no osciallation.  A damping ratio of 0.0 is considered undamped, meaning that the oscillations will continue with a constant magnitude.  Negative values result in an unstable ground handling situation, and values greater than 1.0 might also cause instabilities by being “over” damped.  Typical values range from 0.6 to 0.95.
12 (1.0)      Extension Time      The amount of time it takes the landing gear to fully extend under normal conditions (seconds).  A value of zero indicates a fixed gear.
13 (4.0)      Retraction Time      The amount of time it takes the landing gear to fully retract under normal conditions (seconds).  A value of zero indicates a fixed gear.
14 (0)      Sound Type      This integer value will map a point to a type of sound: 0 = Center Gear, 1 = Auxiliary Gear, 2 = Left Gear, 3 = Right Gear, 4 = Fuselage Scrape, 5 = Left Wing Scrape, 6 = Right Wing Scrape, 7 = Aux1 Scrape, 8 = Aux2 Scrape, 9 = Tail Scrape.
15 (0)      Airspeed Limit      This is the speed at which landing gear extension becomes inhibited (knots).  Not used for scrape points or non-retractable gear.
16 (200)      Damage from Airspeed      The speed above which the landing gear accrues damage (knots).  Not used for scrape points or non-retractable gear.

Everything Ozzy has said is correct.
I was just trying to keep it simple.
...and after three large Gins I am very simple.  :#}

I hutterly agree with the point about too much info! I've just been getting me head around water contact points.

Just to add confusion: when I adjust the vertical position of the wheel contact points, I have to increase the negative number to raise the wheel! So e.g. if -9.5 is the wheel up to its axle in the ground, then -11.5 might well get it out.

Pass the Gordon's, somebody...

OK, I've installed the Trislander (to FS2002) had a quick tweak. Please try replacing point.0 under the [contact_points] section with this line.

point.0=1,22.000000,0.000000,-6.916667,1600,0,0.57,75,,0.000000,0.000000,0.000000,0.000000,0.000000

The nosewheel is the correct height above ground & doesn't need changing. Basically, I've reduced the static compression & increased the damping value. The trick is to do this without making it too springy. The nosewheel will partially disappear below the ground under braking. This is quite normal as it's an older FS2000/2 model without animated suspension. Please remember this is only a quick tweak. It's a long time since I've messed around with this stuff  & I make no guarantees. Back up the original Aircraft.cfg before trying it.

PS. I've marked the changed entries blue.

Great info on the contact points. I'm going to see if I can use it to get rid of a problem I have with a Grumman Albatross.
If you set the parking brake and run up the engines a little, not only the nose gear, but the entire nose sinks into the ground.
Forget about LANDING the thing.
Paul Shell