No - that's not my tractor Tom - mine has got lugs on the rear wheels!  But it has the same size 10" wide steel rears as mine.  These 10" steel wheels are very rare I think - seem to remember that Dennis B told me he had only ever seen one set of them.

My grandfather had cultivators and ridging bodies for his Challenger like this, but the set ups were made by another company.  I seem to remember that my uncle told me one was made by Trafford Park Estates workshop very near the Manchester MH factory, and the other type were made by a company called Standens over in the east of England.  This discovery of Malcolm's makes a third company. 

The Challengers were fitted with mechanical lifts produced for Massey-Harris by Harry Makintosh of Forfar in Scotland.  My green wide front Challenger has one such complete lift assembly on it and it is the only one that I know of - but having said that another will surely come out of the woodwork!!!  The same type of lifts were fitted to wartime rowcrop MH tractors here

John