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Brian I restore a few Nikon lenses I've managed to pick up extremely cheap because they have a stuck mechanism or minor fungi. Normally in a price range I couldn't afford but if I can score them for around $50 I can afford to take the risk and strip them down. I've acquired some very good lenses this way and gotten them working (I'm poor not cheap). One still has minor fungal intrusion because it is between the glued elements and I wasn't game to go that far with the destructive cleaning but it's not visible in images and the lens performs well. A couple had stuck zoom mechanisms, one was loose screws and a very easy fix after a full strip down of mechanisms but information isn't always impossible to find and my son has good eyes and is smart (I have poor eyesight) and can see the tiny stuff I can't see (though I will put up to 4 pairs of reading glasses on if necessary to see, mainly doing electronics). I do have good help with the younger eyes.
If the eyepiece is not of usable quality as it is and it's long been paid for and not valuable to sell in it's current condition it boils down to having little to lose and valuable experience to gain (even if just for your own benefit) but do search for instructions for a higher chance of success.
Be careful which order the glass is laid out in if multiple elements. I had one camera lens (old Pronto lens from non functional Zeiss) and as I tried to put one element back in I dropped it and had no idea which way it went. Since I'll never use the camera and it just goes in my collection, while annoyed with myself it's not of major importance but I'd rather not have those problems and get everything right. Otherwise the rest of the complex lens mechanism is now working, it wasn't when I obtained the camera.
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