On 18 August 2015 at 18:15, Jon Elson <[email protected]> wrote:
> I use a cheap Chinese knockoff of an indi-col.  But, you can
> probably cobble up something easily that will work as well,

You can use a coaxial.
A cheap aftermarket brake disc makes a nice target surface.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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