2 things to say… Bulleye
2 things to say…
Bulleye is COE90, so your small glass circles should be COE90 too.
The steel circle will increase the heat around them, so it increase strongly the melting of glass along the metal.
Otherwise, you are looking for a “supertack”, meaning the to set top temperature a bit under the minimum to full fusing. At this level, the small circles should penetrate in the large glasse up to 80/90%; but consider the metal will influence that.
Do as we all do: testing!