Great input. I knew you guys would know what to do.

I looked at it when I got home and it snapped off above the nut. so I can probably still use it as a leveling point. I'll then drill through the base of the pole, the base plate and into the concrete. Epoxy an anchor in (that sticks up through the base plate and base of the pole) and use that as my 4th "through" bolt support.

Sound good? My 13 and 15 y/o and their friends need it pretty secure (it lowers down to 7.5 feet).