Some things to know when buying o-rings:
- Know what profile keycaps you will be putting these on.
-- Cherry profile takes smaller o-rings than OEM (most stock ABS caps).
- Check if you keycaps have crossbars. It is my understanding that not having a crossbars (on a Y key for example) can change how much an o-ring changes travel. I think some of the SP caps do not have crossbars, but that is just from memory. If anyone notices that they do not have crossbars under their cap, post where you got it.
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Read my post here to get an idea how kind of key travel / o-ring size / profile you are working with.
- Look at this image. I made these measurements with a caliper. If you can see images of the o-rings you are buying, you should be able to get an idea of how thick they are by comparing their proportions with the image bellow.
Personal preferences:
I tend to like a little bit of key travel reduction. Standard switch travel is about 4mm. I tend to like about 3.5mm. I am using relatively soft o-rings that I measured to be 1.45mm with Cherry caps, and I am pretty happy with this setup (with browns). I tried an o-ring that I measured with a calliper as 1.75mm felt too big on Cherry caps, but felt nice on an OEM keycap.