All scroll saw I am aware of use the 5 inch blades. If it is designed to use straight edge blades and not the pinned edged ones that will be a plus for you. If things get too difficult trying to get it running for you as you want it to, then I would go back on line and look for something newer. I hope you get it going though. Is the saw veritable speed or only one speed, as that is also very helpful. As you probably already know the blade you purchase in the big box stores are not the ones you need for scrolling. Ask if you need to know where to go to find the right ones. Blades are kind of like cars, it seems like everyone likes a different brand blade. If you have any difficulty or questions please continue to ask for answers here in the Village.
Welcome to our family from Southern Arizona.
Dick
heppnerguy