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A lazy susan bearing is too loose, you really need some sticktion. Clean up the original bearing with degreaser and spray with silicone spray or what you would use on a sliding door runner, a dry lubricant. MDF is a compressed wood, so it will absorb moisture, prime it, oil paint it and seal that with a spray lacquer. You can buy the adhesive edging on a roll, apply with a heat gun. Have built a dob base for a 12 inch GSO, tried the lazy susan and had to fit pieces of carpet to increase the friction. I used plywood and hardwood bracing glued and screwed.
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