Zipstik microswitches

[Daedalus]

It's a good while since I changed the microswitches in a Zipstick, but from memory, they're the "miniature" type as opposed to the "sub-miniature" used in some mice. From a quick look, I would say http://uk.farnell.com/marquardt/1005-0401/switch-changer-1-contact/dp/1831098 is probably fine. If you have to change any of the X or Y ones, probably best to change all 4 or it'll feel a little different in some directions... Just open it up and double-check the actual switch against the spec sheet on the Farnell website.

By the way, Farnell (in Ireland anyway) have a minimum order of €20+postage, so it might be easier to walk into a local Maplin and grab one off the shelf. Bring the old switch with you to make sure it matches!

[Daedalus]

Yeah, that looks like them alright - they're a standard size and layout so they should just be a drop-in replacement. Having said that, you can get large differences in quality from manufacturer to manufacturer, and they look a tad on the cheap side. But worth a shot anyway for that money!

Also, the actuation force required also varies greatly, so I would recommend changing all 4 switches at the same time, or it'll feel weird in some directions...