Product review (5 stars): Quality replacement
The metal support on this part is a huge improvement over the original manufacturer's all plastic construction.  I initially thought I had the wrong replacement part.  All the numbers matched but the existing part appeared to require a spline-type of shaft sort of like this * except with more points.  The end of the timer shaft also had the corresponding * to fit.  The new part is a threaded part, however.  What to do?  Well I realized that the old knob had had a metal insert just to provide the threads for screwing the knob onto the timer shaft.  That metal insert was still threaded on the timer shaft.  What I was looking at was the old knob which was missing the metal insert.  After unscrewing that brass colored metal insert from the end of the timer shaft what was exposed was a threaded shaft compatible with the new replacement knob.  By the way, the replacement knob was shipped promptly after ordering and it arrived quickly by US Mail.  The new design distributes the torque forces across a considerably larger metal support that is almost as large as the entire back of the knob instead of just a small area slightly larger than the timer shaft.  Huge improvement.