Thank you so much for helping. Yesterday I try to make off-mandrel rings, and with some practice it should work
It's hard to obtain uniform shape. I was thinking that maybe it is better option to 2mm sheet, cut it to desired sizes and melt it around grafite reamel.
Three Muses Glass, I purchased from UK (I live in Europe and shipping from US is to expensive) White aluminium oxide abrasive paste for the removal of scratches from glass.