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Ramon Wilson24/07/2022 21:29:36
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John if the cover is as hard as it would appear likely you could try annealing it. The secret for success on that for cast iron is allowing it to cool as slowly as possible.

If you have, or can source, some fine ash from a fire this is about the best you can get for a home job.

Heat the ash in a container as hot as possible then heat the component to a good, uniform, bright red heat. Form a cavity in the ash and drop the cover into it and rapidly cover it over with a good thick layer of ash. Just leave it to cool right out as long as possible. Don't be tempted to pull it out to check it too soon as you may risk chilling it again! Though it will look pretty crappy once done you won't damage it and you can do it again if necessary.

Here's my simple set up for treating bearing balls so they can be drilled for governor weights

Cooling in very hot sand

Hot dry fine sand will do the same but you need to slowly reduce the heating of the sand to get a good result - ash is much the better.

Doing it in a barbeque is another option - just let in cool away from any breeze in the embers but you have less control over the situation.

Personally I'd go for the ash treatment every time

Tug

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