Backup light / 1-4 issue

[Matt B]

Well, it's just a tad bit smaller sized than the bore diameter. So there's not much room for it to actually move, no place to go. I hope...

For sure it's better to grind down the mating surface of the switch to get it deeper down the hole. But as long as I don't know where the root cause lies I rather not make any mechanical changes but take a reversible interim solution to gain some time