Mine cut like butter with the 4" grinder and cutting wheels...lots'o sparks so being vigilant is important....
PLEASE don't put a solid coupler back on...that's why you are where you are now! make it easier for the next time whether you or the next guy.
Either way the shaft has to be trued and the coupler mated at right angles...if you can do that great..but take her to a machine shop if you can't.
2 years ago I had a shop purchase and true my shaft and coupler...plus flame spray some pitting where my stuffing covered the shaft.
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