Merge mirrored sheetmetal pieces

[GL_9723777]

I have modeled half of a sheetmetal part. I then selected the part in the model tree and mirrored it. In the options for the mirror I have selected "Merge to model". How do I join these two parts along the seam created by the mirror, on the top surface? I would have thought that "Merge walls" was the tool I needed, but I can't get that to work with any combination of selected surfaces.

[tbraxton]

When you mirror the part is the mirror creating a new body? If not and there is only 1 body in the model, then more info would be needed to figure it out.

[GL_9723777]

No, a new body is not created. The mirror just shows up as a feature in the model tree.

[GL_9723777 · Accepted solution]

Figured it out. The plane I was using to mirror was offset incorrectly. This resulted in slight gap between the original and mirrored halves, which prevented them from merging together during the mirror.