Delta SM600 Scroll Saw

Hi everyone, I have this scroll saw but unfortunately I broke the square nut that clamps the blade into place. I was wondering if any of you out there know what size this nut is? I know you can go online and buy a the exact nut, but I just can't swing $10 for a single nut. So any help would be appreciated. Thanks, Michael

Does anybody out there know, it would be greatly appreciated!

I would take the broken nut to the hardware store and get a replacement there. Or take the part is goes on, into the store and match it up.