Brake bias dial for sim racing. I use this with a bodnar joystick controller and a CTS288 rotary
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http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=94&products_id=204
http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=98_75&products_id=191
