If you are looking to buy, it’s horrible.
If you own, it’s a PITA learning
Im a steel
boat owner, no direct experience in your situation. That said I don’t think you will really know until you get into the project
. My gut says what you have is toast, but that’s not certain. On the good side steel is pretty easy to work with if you have good tools and a bad attitude.
IMHO, with far to little info, I suspect this is the road you are heading.
1-Unstep the mast.
2-Get down there and remove the bad section. An angle grinder with some cutting wheels will do the trick. Wear welders gloves! It will take a while and require learning
several new curse words.
3-Once you have the area cleaned out then you can fabricate a replacement.
You may have to be inventive to get something that works in that space. It is likely good welder should be able to make what you need in 3 hours. A few hundred bucks.
If you can not do this yourself you are likely into a VERY expensive repair.
Why not call Hunter and see if you can get some guidance? The worst they can say is “No”. They should be able to provide drawings of the original piece.