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i would try running the same size tap down it first if you have any threads left it may hold without shifting on you...but that is a big guess at this point as I can't see it or feel it.
If you can cut new ones on the right to match what is remaining on the left you may be good to go otherwise you will need to cut new ones a larger size.
Can't emphasize enough how much cutting oil you need to use last thing you want to do is break the tap off trying to cut new threads.
Have you cut new threads before with a tap? If not ask now not trying to be a PITA just trying to help.
DON'T go to harbor freight. Grainger, McMaster-Carr, Tacoma Screw... All cary premium products. Buy the best that you can, they will last a long time. I have taps that are well over 40 years old and still cut.
Cast Iron is cut WITH OUT CUTTING FLUID.
I don't see anything wrong with using a nut and a bolt. If you don't mind putting a metric bolt and nut on American Iron, you can go just barely under sized.
I don't see anything wrong with using a nut and a bolt. If you don't mind putting a metric bolt and nut on American Iron, you can go just barely under sized.
US to Metric Conversion Table
US
(inches)Metric
(millimeters)1/161.61/83.23/164.81/46.45/167.93/89.57/1611
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