I have seen plastic spacers or wood dowling used down thru any hole that is 
left.  Then a big flat washer or flat stock with the red silicon rubber 
under it as a buffer?  Use plastic bolts or all-thread, you don't want to 
add a shorted turn in the hole or couple voltage to the top washer.

----- Original Message ----- 
From: "Marcel duchamp" <marcel.duchamp@sbcglobal.net>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Thursday, December 29, 2005 10:32 AM
Subject: Re: [EE] Supplier of washers for toroids?


> Harold Hallikainen wrote:
>> No special material - I think the ones we've been getting are steel.
>> Finding "fender washers" with about a 2.5 inch diameter is difficult. 
>> When
>> we do find them, no one has a package of a thousand or so. Better than a
>> flat washer would be one that is "dented" where the center is in a
>> different plane than the outside. This helps keep the chokes from
>> wandering around the bolt. Any ideas?
>
> Mcmaster-Carr... or your local CNC sheet metal fabricator.
>
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