DIY hydor?

[Dale]

Hi kwirky,

I assume you are referring to the Hydor brand rotating head for a powerhead (otherwise none of this will apply )
Here are some pics



an exploded view



the guts



a view of the impeller



The flow from the powerhead turns the impeller.
The spiral ridge on the impeller shaft turns the cog wheel
The cog wheel interacts with a cog wheel around the rim of the rotating head

It cost $25 CAD.
I couldn't make something like it.
I have often thought that a simple pop up rotating sprinkler head would do the same thing if you could figure out how to stop it from clogging up.

Hope this helps.
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ZB50