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Here are a couple of pictures from Pete Ganze.  As you can see the "Ametek" pivot can be used even with a large motor as long as you have a large enough tail/vane to counter-balance it.

Pete has put some large blades on his unit to capture the low wind speed he has at his location.

Here are a couple of pictures from Bryan Rossel.  He also managed to talk me out of some of my prototype adaptor plates.  

He didn't like having the pivot bearing surface to be just a plain washer so he modified his unit to accept a ball bearing.  Even the slightest breeze makes this unit turn into the wind.  I'm not sure that a larger tail/vane would work just as well. 

Here are a couple of pictures from Richard Kmett.  Talk about fancy paint jobs!!  I've never seen anything quite like this.  

Take note that Richard is using an Ametek 99 motor.  If you look close you will see that this is mounted above the standard "Ametek" pivot on a special adaptor plate.  Richard managed to talk me out of a couple of my prototypes.

Here are some pictures sent in by one of my satisfied customers.  Bob Crowley.  I'm happy to say there are now dozens and dozens of these "Ametek Pivots" out in the world.  And I do mean world.  I have sent some to Norway, Portugal, France, England, and even Canada, not to mention the foreign country of California.  (some of those people are different, but that's what makes the world go round)

I have to admit that Bob has a really good looking unit here.  The tail looks especially sharp.  I would like him to use the "pipe spacer" method to clamp the front adaptor plate to the pivot.  I think it would make it more rigid.  He claims his stainless steel all thread are very strong.  I saw this picture first and thought his "Genny" was balanced from that single wire.  My first thought was that his tail was way too light.  After seeing the top picture I realized that he had two wires holding it.   

Hanging the unit from a wire strung through the mast thru hole would be a good way to check the balance of the tail verses the motor/blades.  You could then add or subtract weight from the tail to get the proper balance.  This does not have to be exact. 

Alan Brinkmann submitted this picture.   He is using metal blades with good success.

A different windmill by Alan Brinkmann.  Here he is using a two to one gear and sprocket setup to increase the speed of his generator.  Its quite amazing just how creative some people can be. 

Here is a picture of one of my units prior to any weatherproofing.   Please note the pipe spacers.  If you have pictures that you are willing to share, I would love to post them here.