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The link you provided is quite interesting - it certainly raises a few questions about the current piers that many amateur astronomers are using. I have been considering putting in a permanent pier and I want to thank you for bringing this to my attention.
There are engineering shops around the Sydney area who should be able to make up a pier to your specifications, but I don't have any that I have personally dealt with. I did get a quote for some gears to be made by a place in Baulkham Hills, but the pricing was a little high for my liking so I decided to try to make my own - spent lots of money but still don't have my gears, so maybe buying them to start with wasn't a bad idea. However, having all this equipment now means that I am starting to make more things out of metal.
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