Last week was " my front wheels don't turn anymore" house calls.
You folks can use a 9/16 wrench and unbolt the drive wheels .
You will see that all of the plastic teeth are worn away - average cost $25,00 for 2 new wheels - SAVE that hour labor bill and check it yourself .
If they did not find cheaper ways to make them I do not think they could sell them. The thing of that is how much cheaper can they make them from now on? Where does it end?