Replacement adapter for the "ALPS Short Stem" keyboard switch for the Apple II or II+
See the pictures or this archived Apple documentation for details:
https://archive.org/stream/DTCA2DOC-223_repair_IIe_1989#page/n53/mode/1up
This is the 12-degree adapter, Apple part #815-0182
Also available as a set of 12:
https://www.shapeways.com/product/3EP5QMT6W/apple-ii-keyboard-alps-short-stem-12-deg-adapter-s