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It really is case-by-case, at least when it comes to manufacturers. GMK / OG Cherry are thick enough to interfere, so it’s a somewhat common problem.

I learned a great way to test for it from :3ildcat - take a cap from the shortest row, put it on an un-mounted switch, and close it down on a strip of paper. If it grips the paper, you’ll have the interference issue.

Another thing that can help avoid the interference is choosing a switch that achieves reduced travel through some part of the stem being longer - even when bottomed-out, the stems don’t go down far enough to let the interference issue happen. Ink Yellows and Glorious Pandas are two stock examples of this kind of switch. For frankenswitches: Halo, Cream, and Kailh Pro stems tend to be good options.

One more kind of switch you could use to avoid the North-facing interference issue are Kailh’s Silent Box line, or the Art Box line they manufacture for Archon. Both series of switches have a shaved-down top housing that gives plenty of room for GMK caps.

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