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I agree with Rusty those screw extractors are usually nothing but trouble. I call them “easy outs” because the only screws they will work on come out easy. Now then, yes you can weld a nut on bolts but I don’t think it will work on the tap. If you are a good welder the first time on a bolt will work, else wise it may take a few tries. It usually works best if you do the welding just before you go to bed and then try to remove the bolt the next morning. As far as the tap, you are working on a 5/8 inch bolt which gives you a little room but not a lot for error. If you have an acetylene torch you can use a small heating tip and get the tap hot enough to melt it out. Once the tap starts to melt I turn up the O2 just enough to start to blow the tap out. The resulting slag will chip out easier with a small chisel than the tap will. Patience here is definitely a virtue as this can be very time consuming. Also, cast iron does not oxidize (cut with a torch) very easy so your chances of ruining the casing are not as great as with regular steel. Another thing that is not common knowledge is that oil on cast makes it very difficult to machine. So all that penetrating oil you used to try to free up the bolt now makes it more difficult to tap the threads. Don’t be upset with yourself it’s a catch 22 type of thing you really don’t have a choice but to use the oil on rusted bolts, then if it twists off you have to deal with the consequences. I wish you the best…
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