Timer knob broke

I went online with Model number and put in a search for a timer knob. The piece I ordered turned out to be the timer knob for the washer (stackable washer/dryer unit). I called and ordered the correct part and had to mail back the 1st one. I learned that it is better to speak with a person when ordering parts to make sure you are getting the correct on. You can avoid a lot of expense for postage this way. Once I had it, it was just a matter of sliding it on to the metal post on the dryer.