My Grapple*, Inferno* and Road Hauler all stand straight.

References
http://www.tfu.info/1985/Autobot/Grapple/grapple.htm
http://www.tfu.info/1985/Autobot/Inferno/inferno.htm
http://www.cliffbee.com/reviews/grapple.php
http://www.cliffbee.com/reviews/inferno.php

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*Both originals and reissues.