Tips on reviving Omron B3K switches?

[chromov113]

I have a keyboard with Omron B3K switches, also known as Logitech Romer G or Creative PRES on Creative Vanguard K08 (this is my keyboard). Multiple switches were chattering and missclicking; applying alcohol to individual switches only helped for a few hours. I found a way to clean all switches at once without desolddering the keyboard, and it functioned perfectly for 4 days, then the same problems have started over again.

Recently I've bought an old Logitech G413 to scavenge parts, now I've got plenty of switches to experiment with. Logi was mostly okay, with a single left Ctrl showing the same issues as my Creative does. For now I only have a few ideas:
1. try polishing contact pads in a faulty switch;
2. remove one of the two contact pairs - I suspect the two contact pairs are partly responsible for chattering.

Any other tips?

[yui]

i though the 2nd contact pair was here to reduce chattering, if they are both in parallel it should in theory make chattering almost impossible... although if only one of them is connected you may just have had an unlucky batch of switches and swapping them may help.
to be fair, i have never used or opened one of those boards, so i am just trying to give you pointers to where you may get somewhere, i may be wrong.

[chromov113]

So, I've tried polishing the contact pads of the switches, and it helps; turns out the "black finish" on them is not a finish, but dirt or oxide. The difference is clearly visible with a simple multimeter. I've overhauled 4 faulty switches, but it seems, the other hundred will ask for the same treatment sometime... Oh my.

For Daniel Beardsmore: hey, for some reason I cannot PM you, even when you're on my buddy list. Hope you're following the topic. The switch S/N reads:

B3K-T135
038 6R1

Don't know what the second row means, I put it here just in case.

Colors are:
case - white
plunger - white
cover - transparent