I'm pretty sure you can only use a primer once.
If I'm wrong, I'd definitely be interested in buying reusable primers.
Figured you might’a heard about how to recharge a primer, maybe not.
1. Remove fired primer from case
2. Remove anvil
3. Clean cup
4. Use a punch to flatten the dent from the firing pin
5. Use a small hole punch to remove a little bump from a roll of your kid’s caps
6. Insert into the cup
7. Insert anvil
8. Seat primer in prepped case, load and shoot.
You have now used a primer twice.