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I basically need a block on a shaft to rotate between 90 degrees (vertical) and approximately 180 degrees (horizontal) counterclockwise on a shaft. I don't want the part to fall below 180 degrees. At 90 degrees it will clip into a stand so clockwise rotation does not need a part preventing rotation. Please advise on a way to prevent clockwise rotation after a certain angle. Thanks :)

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    $\begingroup$ A slot with a pin. $\endgroup$
    – Solar Mike
    May 11 '18 at 20:07
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Ok, so completely not the best image, but if you have the shaft with a hardened pin fitted - the angular width of the slot can be adjusted to control the angle of rotation and it only needs to match the width of the pin...

enter image description here

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