Lazy susan bearing for 12" lightbridge

[OneEyedSam]

The "stock" bearing on a 12" lightbridge is 12.5" in diameter and as discussed elsewhere, gives rise to a bit of a wobble.

I'm looking to replace it with a larger lazy susan bearing. So, a couple fo questions

1) what size, I'm thinking 16" , what have people used in the past

2) suppliers of larger barings are a bit thin on the ground, anyone know of a supplier of 16, 18, 20" bearings?

3) is lazy susan the way to go, or is teflon sheets a good alternative ?

Simon