Once again, Joss & Main to the rescue.  I have a screened in pool, and a table w/an umbrella.  I purchased 2 umbrellas for areas around the pool where I have lounge chairs for my family when the visit.  However, the bases were too big.  The umbrella poles are very thin.  So I filled the bases with foil to steady the pole but it doesn't hold them very steady.  So because of my surprise with the cork board, I said I bet they have something I can use.  So, once again I turned to Joss & Main, found these lovely bases which do the job nicely.  I really am pleased and now my pool deck does not look patched together.  Again Thank You.