Good to see the liquid inspiration in the background is working 🍻!Well the clutch housing is buggered.
It looked a little off when I went to clean it, wiped the crap off the front and its cracked pretty good.
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With second hand Thomas winches and parts being a bit thin on the ground, getting a new one will be quickest and easiest, can't imagine it'll be cheap though.
I had a thought on a repair catering my inability to weld cast aluminium: grind the rib off the inside of the housing, cut some appropriately sized steel plate for both sides of the mounting flange to essentially sandwich the cracked face. Probably through bolt it in each corner of the sandwich plates and of course tap the mount holes into the steel plate inside the housing.
Not an ideal repair, especially since the mounting flange doesn't appear to be 100% square anymore. But its already stuffed, I can't stuff it any more.
If you have a means of welding aluminium (MIG, TIG or Oxy), I'd try it. It may not be recommended, it may not even work. But molten metal will tend to stick to molten metal.