I would cut the tree, check the growth rings. If they are good I would at least split in half or quarters and then peel the bark and sapwood off of one of the staves to check for borer damage, if any is found peel the bark and sapwood from the remaining staves. Seal the back and ends with shellac or wood glue and let them dry. Any staves that you do not peel the bark and sapwood from must be treated with an insecticide. If you need help with the rings, post a pic of the end after you get it cut. Hope this helps, and good luck.