Fixing one issue found with assembly/cogs, partially fixing another.

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extra : source : 105be5f5e8ee6713239debbe29bf1b20674b7478
Fixing inability to add cogs to assemblies

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extra : source : b13d9b41dad553a5cf9372dd28b6b41b398a0555
Minor docs adjustments and fixes for cogs on assemblies

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extra : source : 53cb31235bf69b64944620e1a037604469d00f1a