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Feb 25, 2018 at 0:22 comment added Oldfart I was thinking of a stiff tile on foam which can just about bare the weight. (You can even put only foam around the edges.) Let's say tile weighs 5 Kg. Then an force of 10Kg would push it down e.g. 5mm foam height, tile of 30x30cm. If the tile is loaded on one side and you have four buttons are about 1/4 from the edges you get a travel distance of 3/4 of 5 = 3.75mm.
Feb 25, 2018 at 0:12 history edited Oldfart CC BY-SA 3.0
added 57 characters in body
Feb 25, 2018 at 0:11 comment added D.A.S. travel will vary with weight and flex from 30kg to 120kg and may have travel issues of floppy floor or over/under travel on buttons of a few mm
Feb 25, 2018 at 0:07 history answered Oldfart CC BY-SA 3.0