Thank you Ray and Astro.
We have an observatory at Port Macquarie and I will contact the person there and they might know someone in the area, were I could have a look at a setup for testing mirrors. No hurry because I ordered a 200mm mirror from China. It most likely will be only spherical and not suitable for a telescope, but I thought I could use it to find out how testing works. I may have squandered some money, it won't be the first time. I am waiting on some books and they might tell me a bit more.
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