Turns out a spanner wrench is needed to turn on the pivots.
By the way, I found this out by emailing the Mahindra importer (via the
Mahindra Tractor - Compact tractors, utility tractors, farm tractors, ag tractors, attachments, implements & farm equipment - all built tough! web site). They called me within three hours of the email to assess the problem and then called me back within the hour to walk me through the entire repair. Incredible. They even explained an approach that is simplier than the one that involves removing the pivots. I have never experienced such excellent customer service with any product that I have owned, especially a tractor. I will definitely take this into account when I purchase a new tractor.