There is a bearing mentiones in the documentation: 127 x 146.05 x 12.7mm INA CSXU050-2RS Bearing
Can you offer this bearing for cheap or another bearing that has the same size?
As my camera's weight isi below 1.2kg any bearing offering the right size should work ;)

Also I need to know about the shipping cost to Germany.
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Mit freundlichen Grüßen,