Problem with spin

Could anyone tell me why i get this when I use spin to extrude 2d elements to 3d elements!!?

Base point is defined at the center but the elements close to it are not spinning!!

Also do u you where i can change node tolerance? when I try to create really small mesh, it keep telling me that the mesh size is adjusted to node tolerance! I think the above mentioned problem is because of that node tolerance. I mean the 3d nodes that are smaller than the node tolerance are not being spun.

Thanks,

Maysam

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