View attachment 1715015190 Depending on the wiper arm post # 3 may not the type of arm you have. Some just have a spring metal tab that needs to be pulled away and to me would be more difficult. Search the forum as in the near past someone posted a picture of a tool that appeared to make removal much easier. If you have the expertise and tools I believe that the tool could be made in a home shop. Picture of wiper arm from 73 Duster .
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