Any idea what mount these are?

[whitecitadel]

Any good for anything? Found them in box of old bits'n'bobs, probably worthless, thought I would check there not priceless

Mystery Caps Back

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Video editing probably not that useful for many people!

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[Findecanor]

They look like those for Key Tronic rubber dome keyboards: the cheaper all-plastic types with flat backplane, not the ErgoForce or earlier with curved back plate and large case with rounded borders.
The side-legs on the larger keys would snap onto plastic stabiliser bars that are mostly on the underside of the barrel plate.

[Muirium]

New Story is an interesting cap. George Lucas could've really used one of those somewhere in the 1990s…

[webwit]

I'm not sure a new story would have come to his rescue. When he tried that, we got that duck movie. I felt violated.

[whitecitadel]

You mean Howard?

I had forgotten about Howard...

Its settled then, I push holes in a piece of card and give them to my two year old as a "control center"...