The easiest and cheapest way to do steel seed on metal is with washers and a stamp set. You can buy a nice kit but they're expensive. I can provide more info if needed :) I also don't mind printing a stencil for you to make the stamping easier
Discussion
In the past i have used washers, along with a blockmit jig and stamp set. Never heard of using a stencil. Would that eliminate the need for the jig? And by the way, thank you for offering.
