Bob Eager wrote:

I'm making up some flat IDC cables which terminate in a 0.1 inch pitch
IDC header socket. This fits onto a board connector with 9 pins (one
omitted).

Clearly I'd like to fill the unused hole to make it impossible to plug
the things in the wrong way round. I'm probably going to use a blob of
epoxy, but does anyone have their own easy way of doing it?

is a proper Polarizing Pin or Key available for the series of connector
you're using?

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