Some people will twist gently from side-to-side to encourage nerves and discs to loosen over. Clean the caliper mounting surfaces along with a wire brush and remove all the rust and dirt. Installation is truly simple and easy, a caveman..never desire. Putting these on my bike is like spreading peanut https://sciencewiki.science/wiki/More_Exercises_For_An_Ez_Curl_Bar_Or_Barbell_Adaptors