Product review (4 stars): Great Knob - but shame on LG design.  Do THIS for a better expereince
I can't tell you how many of these I have purchased in the 4 years I've owned this LG cooktop.  Can't blame the parts dealers for that, that's totally an LG OEM design issue.

That being said, I have found that you can add a HUGE amount of life to these by doing this.

1) Get some 1/2" heat shrink tubing.
2) Cut a couple of pieces a little shorter than the stem.
3) Put one one a time and with a lighter, roll it around while heating it up.
4) Do it again for the second layer.

What this does is strengthen the stem significantly so that when the knob is turned past it's limit, the plastic stem doesn't break/crack.  Guaranteed to add much life and reduce the delicacy of the design.

Hope this helps anyone that haves issues with these.