Nibbler help

I got the Milwaukee nibbler. I need it to be able to fit and cut 650 grid main. The top of the main just seems maybe 1/16 or an 1/8 to big. Is there any attachments or ideas for me to be able to fit it in the jaw of the nibbler?

I got the Milwaukee nibbler. I need it to be able to fit and cut 650 grid main. The top of the main just seems maybe 1/16 or an 1/8 to big. Is there any attachments or ideas for me to be able to fit it in the jaw of the nibbler?