Mirror in an assembly works double

[KarolR]

I mirrored both parts around plane 1.
Part 1, the plate at the bottom, mirrored o.k., but the beam with holes, apart from being mirrored, has also turned upside down. look at the 4 close holes at the top of the left, the original, and see them in the right part at the bottom.

[stevsmith]

When using the mirror components option there is an arrow that takes you to a second page where you have to specify that the mirrored part is "opposite handed"
I can't open the file just now, so I'm trying to explain this without any visual aid.

[stevsmith]

When using Mirrored Components in an assembly. to get the "Opposite Handed" version. Click on the arrows at the top right of the options menu.

1.png

This will change the page and give you the option "Create opposite hand version"

2.jpg