Before inserting the hex key, please make sure that it’s straight as an arrow. If it’s slightly bent, try to bend it as straight as possible.
Then insert the hex key into its groove/hole from above.
Ensure it moves freely and smoothly through the hole - if it doesn’t, enlarge the hole and the slot and/or use some lubricant.
If necessary, cut the heat shrink tube near the bend in the hex key, so that it does not touch the plastic holder or the micro-switch anywhere!
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