Can you post photos of them?

sorry but I can't understand your language...
How about try to transfer the text to photo and try again

Hi, they just use the same cable..

Hi, I wonder where did you buy it? please contact with the seller, then we will offer warranty through them.

The laser will burn edges of your paper, and I don't think it can cut the items you said, this machine is used for engraving.

Can you take a photo of the brass nuts?
And when you assembly them, better adjust it firstly to make sure it can be moved smoothly, then tighten all screws.

I don't know too much about it, but I think you can save svg to .png and try again