Snap dies fit Handy Jr. machines ONLY if the machine pin (piston) is replaced with an Osborne pin. If you want to continue using button dies, you MUST also purchase an Osborne plate. You are essentially turning your Handy Jr. machine into an Osborne machine. Your machine will function exactly the same and you can switch the old pin back at any time.Your snap die must be modified to fit your Handy Jr. base.