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Holes for limit switches are too big.

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Umm well its slightly tricky to see exactly whats going on from that picture, but I think this is what has happened.

The bolts are supposed to screw INTO the black plastic limit switch body. You are trying to pass the bolt through the switch, through the wooden frame and have enough sticking out for a nut.

The threads into the black limit switches are not very good, its extremely easy to strip them. And I have heard of

people getting them with holes big enough in teh switch that the threads dont grip at all.

So if your bolting right through doesnt foul anything moving inside the machine (check the wooden blocks for XY axis movement). Then it might be a good way to do it anyway.

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