Now the very day that it arrived a neighbour borrowed it, along with my tractor, but unfortunately he rang me an hour later to say he'd broken my tractor

The flail being on the three point linkage, and being a very lop sided and heavy load, had put more strain on one lifting arm than the other, resulting in the cross shaft breaking due to the torque - an 1 1/2" diameter high quality steel shaft

He mended it as those were the terms of the 'lend', but it meant that I wasn't prepared to mount it up again in that configuration.
Now I've bored you all witless in threads such as the 'enlarging a hole' thread where I was attempting to take the load off the hydraulics and take it elsewhere:
http://madmodder.net/index.php/topic,9728.0.htmlBut those attempts also resulted in failure - far too much twist due to the lop sided load. So I decided to convert in back to 'Axle Bracket Mount' hence the thread a few weeks ago about 'Glueing Metal Back On':
http://madmodder.net/index.php/topic,9885.0.htmlThe original 'fore and aft' spars on the flail had been chopped off and brackets welded on for the three point linkage. Now these spars are 100 mm square box with 6 mm wall thickness, and I had intended just to weld bits back on to bring them back to the original length. But thinking of the huge torque that they have to withstand I decided to replace them in their entirety. Theoretically they just bolt onto the very substantial hydraulic tank, but it remains to be seen how easily they come off.
This is what they looked like according to the parts book, which is the only documentation that the original manufacturer has after suffering various take overs