Quote Originally Posted by uncle_bob View Post
Hi

If you are using the correct hardware, your extrusions are not tapped deep enough. You can either have Colin swap them out or get a tap and clean up the parts you have. If you have tapped parts before this one is no different. If you have never done it, spend some time with YouTube. There is a bit of a technique to doing it without breaking the tap.

Bob
I think the nuts are tapped, but I think the screws are bottoming out in the extrusion.