just examine the bad one as you pull it apart and you may not need to mess w/ the string - the control shafts are usually what holds the face assembly to the unit, and taking those big nuts off lets the whole face assembly slip off, string stays with the shaft that runs it
if your good radios' pointer doesn't move than you'll need the bits for that, but maybe all you need is to dab some fresh paint on the pointer, and the string is replaceable - start w/ both controls turned all the way to one end and you should be able to take it off one and switch it to the other
Bill
