Re: My Girls wanted to help again.
Quality time! How neat would it be if more parents took the time to introduce their children to reloading/shooting while the kids are young and attentive...if you get them on the right track when they are young, it will be much easier to KEEP them on the right track as they mature.
I have been reloading since 1964. My son and daughter were taught to shoot from age six. They also "helped" (always under my supervision...as I see you are also a "hands on" parent). My 11 year old grandson spends a lot of time with me...reloading, shooting, and hunting. Few things bring as much joy to an old man as "Quality Time" spent with his Grandson!
I would make one suggestion (I know it is none of my business, and I mean no disrespect). Please get some inexpensive shooting glasses for your girls to wear while they are handling primers. When my children were helping me, years ago, neither they nor I wore protective glasses while reloading. In 1984, I had a primer detonate while seating it in a .38 Special case on a single stage press similar to yours. I got some debris in my right eye. Luckily, I was able to wash the particles out of my eye with no permanent damage. Since then, I (and anyone else in the room) wear some type of eye protection when reloading(just like we do when shooting). Those beautiful girls are only issued one pair of beautiful eyes!