It is supposed to be a straight pull, I did not fit it, but when tugging, it seemed to loose straightness, so I will be sending it back. There are 4 spines on the buried shaft at the end of the motor, and the attachments each have 4 slots to match. I am guessing now that the not large family member that fitted it did not line it up properly? there seems to be no lead in chamfer at the bottom of the attachments.