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This seems to do the trick - though I could not find that evidence in Malgorn, whose content I often treat with some scepticism. There are quite a few blunders in there!
GB 4 KudoZ points were awarded for this answer
Explanation: Both Limusa and Collazo have "star" when referring to electrical. Díaz de Santos only has "star" and thus no discrination in usage. When mechanical in nature, both Limusa and Collazo state "star" or "spider". Collazo also lists "yoke" in this case.
Of course, the safest course, out of context, would be "star". However, if it is indeed mechanical, choose among the three - the one that sounds best to you.