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No problem. Made it 4 sizes smaller then hammered with 1 oz ball pein - took it up to size P. No problem. Didn't seem to need to anneal.
Thanks again for feedback

Thanks Dennis. Not sure where I'll get a strip of copper 2.3 x 2 mm so I'm just going to try with the gold strip I have. Will post how it works out (or not!)

Many thanks for the rapid response Peter. I haven't worked with gold for decades and don't have access to a ring stretcher. I start my silver rings with 1.2mm sheet so when 'well hammered' on the...

I have made and sold a lot of textured silver rings I have named 'well hammered' (see pic). I have to start them 5 sizes smaller as they stretch so much when I hammer them on a tapered ring mandrel....