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Hi Michael
I got the tube rings for my 12" newt from Orion Optics in the UK. At the time I investigated it, there were no local suppliers of them - the biggest the aussie suppliers had was for a 10" tube.
Some people have made their own, or had them made at a local metal fabricator etc.
Just be sure you measure the outer circumference accurately when you give the measurements.
The ones from Orion Optics weren't cheap, especially with shipping. And especially now with the low aussie dollar.
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