Unbeknownst to me, the tip came off my Cynergy and I hit a few balls before noticing the missing tip. As a result, the ferrule surface got banged up and a side of the ferrule seemed pushed in. I sanded the surface and side down, put on tip, and the tip did not glue flush with ferrule. It seemed OK until it wore a lot and then balls would not go as far as what I could to do easily with other cues. I removed tip, sanded ferrule surface to square it with shaft. I sanded side of ferrule to remove lopsidedness. Most damage was at surface contacting tip and sanding seemed to make it flush with shaft (a little thinner at the tip end than it used to be) and square with tip. Its no beauty now but seems OK.
The last two photos made after 1000 sandaper put to ferrule and tip:
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