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I have a very recent V2 model and the arm is different than the one you show; yours will not work on the newest model because the pivot shaft is larger and the roller is mounted differently. I broke the roller shaft (plastic part of the original arm) trying to get the roller off, and had to make a top brace so the roller would be usable. It's ugly, but will work until I can replace the original arm.
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I have a very recent V2 model and the arm is different than the one you show; yours will not work on the newest model because the pivot shaft is larger and the roller is mounted differently. I broke the roller shaft (plastic part of the original arm) trying to get the roller off, and had to make a top brace so the roller would be usable. It's ugly, but will work until I can replace the original arm.