Thank You for your response.

I'm not too familiar with button mappings however from your response I have made the following adjustments however it still doesn't seem to be working?

I changed the radius bend properties as the button code for this was just "Bend" not "RadBend" in hope that it would trigger it to pick up the Square Bend but still no luck.

I also added the square bend to the button mapping and moved it up to be grouped with the other Bends.

Through more research I have found many peoples mappings are under a section called "------Revit Mappings-----" is this mandatory or optional?

See attached for relevant images

Thank you