So there are a couple of old thru hull transducers in my bilge that look like they are from the Stone Age. Neither functions at this point and I have already replaced the old electronics. I noticed on the weekend that one of them has a small weeping leak. They both appear to be threaded into a sleeve that’s epoxied into the hull. I was able to hand tighten the leaking one a half turn but it didn’t completely stop the leak. What ‘a my best course of action here? Boat will be pulled in a month or so. Remove and replace o rings? Can you purchase a blank for the hole and lose the old ducers? Clean and apply sealant? Pull them both and glass over? I should have taken some pics. I think they are from an old depth/speed log. Likely from mid 80’s.

Thanks