I do have a s.n. it doesn't show a hole there. This hole is about the size of a ball point pen tip and located about 1" from the needle bearing in the end of shaft.Yes,it has been worked on before by someone that patch it. This guy bought it at a sale CHEAP and it has not worked right since. I think he bought it not knowing what to look for. I have worked on 580ck & B models in the past. But I do not remember of tiny hole on that inter tube in the shaft. Because if it was in forward gear for even 10 min. it would fill the shaft with oil & some pressure. Iím having low pressure in forward
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