My window stopped rolling up today on my 91 Ford Ranger XLT Extended cab. I thought it was the plastic handle that stripped and was prepared to get a new one but decided to use the passenger side one for the time being. Wrong - the spindle spins but does not engage fully the teeth of the semi circle wheel to roll up the window. How the heck does one replace that on a sealed door? Do I have to buy a new door? Help.....any and all suggestions appreciated. Tom