Product review (4 stars): Exact Replacement
I ordered 5 of these knobs to replace the burner control valves for a Jenn-Air JDR8895AAB range owned by a customer of mine. Each of the old knobs was split open on the hollow neck that slips over the gas valve stem. Fortunately the new knobs are the exact replacements for the originals. Unfortunately, they are of the same poor design and materialso they will eventually break like the originals.

In order to try and mitigate this problem, I decided to do a modification on each of the new knobs. I went to a hardware store with the idea of finding some pipe that would fit securely over the outside of the hollow neck on each knob. I couldn't find a pipe that would fit securelythe ones I found were either too large or too small. Consequently, I decided to get pipes that had an inside diameter smaller than the outside diameter of the neck, but with a slit down the side. The slit allows me bend open the pipes thereby increasing the inside diameter just enough to allow the pipes to fit securely over the neck of the knobs. The pipes I found, however, were approximately twice as long as needed, so I had to cut them in half. (I uploaded several pictures to provide a better idea of what I am describing.)

Only time will tell if this reinforcement modification keeps the new knobs from eventually breaking, but if nothing else it should increase the time it takes for the new knobs to break. Ideally, I would have liked to use pipes without a slit on the side because they wouldnt bend open over time which could happen with the slitted pipes I used. If I had to do it over again I probably would go with a pipe that had a larger inside diameter than the neck of the knob and filled the gap in between with something like JB-Weld.

A final note: When I installed the new knobs several would not slide all the way down the gas valve stem. Upon further inspection, I noticed that the small metal D-ring from inside the old knob neck was still around the stem on the problem valves. I pulled the old rings off and was then able to slide the new knobs into place. (I uploaded a picture of a new know showing what a D-ring looks like.)

Thanks for reading.

*****2016-02-12 Update*****
I had to go back and edit/correct my original review because I found out that Amazon had it all messed upmaking it  somewhat indecipherable (e.g. misspelled words, broken sentences, repeated words.)