Captain Mannering, you are right once again, sorr!!...
But it is good to have the detail across our screens. Thanks Tony.
I will also point out to John that his track is made up of 21 link sections incase he hasn't noticed.
John, What continent are you residing on/in? Maybe you could post a picture of your carrier, or failing that, you could list some part numbers that you'll find on bits of your carrier, to help I.D. the critter.
Does it have big headlights or little ones?
Does it have flat spokes on the wheels or is the spoke an "H" section?