One thing the plough/dozer blade is missing, is the handle and linkage to pivot the blade, left, right and centre. So the handle I made has been gathering dust on a shelf.
Yesterday I fitted it then had a scrat about for parts for the linkage. The results are in the following photos.
That section works. Now to find or make a lever to operate the fulcrum, to pull the chain, to operate the locating pin.