Articles about turntable setup.

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https://www.analogplanet.com/content/how-use-usb-digital-microscope-set-92-degree-stylus-rake-angle-sra

http://www.forums.stevehoffman.tv/threads/usb-microscope-for-vta-sra-measurement.496603/

https://www.analogplanet.com/content/video-showing-setting-stylus-rake-angle-using-digital-usb-microscope

https://www.whatsbestforum.com/showthread.php?7112-Article-on-using-USB-microscope-to-set-up-cartridges

https://galibierdesign.com/support/vta-sra/

http://www.theabsolutesound.com/articles/setting-up-a-phono-cartridge-1/?page=3