Thanks to Mikewint I now have handles that fit the numerous scalpel blades I ordered that did not fit the original handle I ordered at the same time. Turns out a lot like Exacto there are basically 2 handle sizes for scalpels and each fit a variety of blades, however they are not always clearly identified as to which fits which.
I did however manage to slice across my finger this morning, did not even realize it until the paint began to turn red that I was working with! Those dang things are sharp! But that is why I bought them!