Manual Spinning Art Mechanism

I'm looking for a skilled engineer to help to resolve a mechanism solution.

Requirements

- The mechanism should be sturdy and reliable, designed to hold an MDF frame of 800mm diameter. - It needs to be manually operated, allowing easy rotation of the artwork. Currently it is fitted with a 12CG Lazy Susan Bearing - Greased (6.330inchx12inchx8mm Round) - Vertically this is not spinning as effectively as it would if it were horizontal due to the gravitational pull on the alignment of the bearings. Ideal Skills and Experience: - Experience with mechanical design. - Ability to create durable and functional manual mechanisms. - Attention to detail and craftsmanship.