I am pretty sure you can have those blades sharpened. I read that Woodcraft was a good place to send blades but it may cost almost as much to get them sharpened as new blades. Either way I don't think you will have much of a problem.
If you have not installed blades in a jointer that may be a problem. They can be a bugger. Go to You Tube and there are several good videos on how to do it. You can also ask questions here. That is why this forum is here, but you know that.
Don in Murfreesboro,Tn.
Measure once cut twice and it's still to short.