Sticky ER-301 buttons (gray only)
I’m beginning to suspect that a few of the ER-301 got installed with buttons that are just a little stiffer than usual and this is just enough to get them to sometimes stick when pressed off-center.
I’m talking with C&K (the button manufacturer) to see if I received a run of buttons that fell outside of specs. In the meantime, according to my own investigations, when there is a button that is sometimes getting stuck or feels stiff, I remove the button cap and measure its diameter. Invariably it turns out to be about 0.1mm smaller than usual which makes it just that much of a tighter fit around the base. If I then replace it with a button cap from another lot with the normal button diameter, the button action is smoother and doesn’t get stuck anymore.
The best way to determine if you have a sticky button is to wiggle a blue button back and forth (left to right) and note how loose it is. Then do the same with a suspect gray button. If the gray button feels stiff in the lateral direction then it is highly likely it was manufactured too tight. Replacing it might give it smoother action.
I want to replace them myself!
If you feel confident removing the panel on your ER-301 and replacing button caps, you can try doing it yourself. The part number for the gray buttons is D6C10-F1-LFS:
(Ignore the round green button in the picture.)
(Ignore the black button in the picture.)
I find that prying off the button caps is most conveniently done with a 2mm flathead screwdriver. Here is what the process looks like:
You are always welcome to send your ER-301 back to me for button replacements. Just PM or email me for shipping address and instructions.