Hi everyone,
I've been getting numerous messages regarding the issue of the plastic core separating from the stainless steel knob, as many of you have also mentioned here. I spoke with the shop that produced the plastic cores for me, and our conclusion is that the plastic core material we chose, while flexible and is very suitable for this core application, is too sensitive to temperature fluctuations, causing it to shrink over the friction tolerance.
What's gonna happen now is that I will be developing a new plastic core. We will be testing numerous different materials for the plastic core, ensuring that they are just as easy to install, and at the same time stand up to temperature changes and maintains its size and integrity. I estimate that this process will take about a week. As soon as the new core is tested to be fine, I will immediately ship 4 new cores to everyone who has purchased the knobs. In the meantime please continue to use the knobs.
I'm really sorry that this has to happen to everyone who are the most eager to get them. I promise that the solution is coming next week, and everything will be handled to your satisfaction. Thanks guys!