Homebrew PCBs

< "sailingto" > wrote:>
> Trying to figure how it works, I expect the hidden mandrel is the secret?> 

There is no secret, the mandrel is tiny and is only pouched for identification. 

The mandrel is used to form and then insert a tube of thin copper foil to line the via walls.
 
> Do you have a video showing how to make the vias?...>

The magic happens between the thumb and index finger.  Pictures are not helpful.  The graphic instructions included permit emphasizing critical steps.

<... I would be interested in good vias, but not willing to buy a "pig in a poke" type product.>  

The kits are priced to compete with the retail cost of raw materials before adaptation to this purpose. If you need 'good vias' this is a great offering. 

I don't understand your mistrust.

Charl