Hi David,

I've unticked 'Merge with original' and clicked apply. The object appears correct (just like on your video) however when I select a random vertex on and move the vertex point along the x axis using the keyboard, the selected vertex stops at the middle edge? It's strange because when I select the option the entire piece highlights however from a vertex it appears that both objects are separate.

Happy to say that after I selected 'Edit Mesh --> Merge Components' with low threshold, the vertex issue was resolved.

Once again, thanks again for your help.