Also, to make this easier you could try this expression for anchorPoint:
//expression begins
apArr = [ _____,_____,_____,_____];
numOfStabilizers = 0;
x = 0;
y = 0;
for(i = 0; i <= apArr.length; i++)
{
numOfStabilizers++;
x += apArr[0][0];
y += apArr[0][1];
}
[x,y]/numOfStabilizers
//end
This one takes care of all the math for you and all you have to do is highlight the underscores and pick whip them to your stabilizers. This expression would probably be easier to use than the first one I wrote for you.
~Colin