Unstable Stand

I was looking for a stand for my Costco umbrella because their stands cost more than the umbrella. This one is not the answer. First, the bottom is too rounded, not flat enough. The tube that holds the umbrella tube grabs okay but since it is NOT secured to the base, the umbrella spins with the slightest breeze. Even filled with water, it tips over with no more than a gentle breeze. I am going to try sand and water mix but this stand is very unstable as is. I am adding another caution...my umbrella has a tilt function. Unusable with this stand because of the spin problem

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