These are the most important objects of the printing. Heating the printing stamps and the hitting the anvil needs very hot oven or light to do that.
I got it from a welder in my location.

Ohhh no no no no - if I didn't know your handle, I'd assume your post to be sarcastic.
I think you totally overestimated the size of what we call 'washers'. What fillippone and I are using are small metal discs, between 20 and 30mm in diameter and 2-3mm thick. They are cheap to procure, easy to stamp and compact to store and conceal.
How do you plan on hiding seed words stamped on
actual barbell weights? I also assume they're pretty expensive to the washer backups we're talking about here.