It's more work, though. I also don't really want to break more springs than I already have by being careless...
I suppose it'd cost more or something? Not sure what other merits the single-piece design could possibly offer.
Also, in reality, there isnt all that much more work involved in swapping around the single piece keys than the caps on the double piece ones - you're going to need a screwdriver either way.
You'd have to go out of your way to break those springs on an IBM/Unicomp board. Just yank the think out with a flathead screwdriver. It helps if you turn the keyboard upside down when reinserting the keys.
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I don't even want to know what you're pulling with the other hand.
We need to have a keypulling contest. The bare hand macho Mexican wrestler crowd to the Geekhack screwdriver jam to the delicate twist and pull of the wire model (still my fave).