I have an in-ground 16x32 pool. We installed it 10 years ago. I just removed the original sand and replaced it. Now there is one bolt that will not go all the way in where the dial valve connects to the tank. I can see that there is not a perfect connection and it is leaking when I run it. I have been careful to not over tighten. I did use petroleum jelly on the o-ring and the hex bolts. I also tried to clean out all sand in the bolt holes and on all parts.
Can anybody give some things to try?