"geoff smith" wrote in message
. uk...

I am seeking advice on the replacement of the moving contact on a 2 amp
Variac.The original "Brush" appears to be made from Graphite and is about
4mm in diameter.
The makers were Zenith Electric London (RIP).

Sometimes these were a critical design, to prevent shorting adjacent turns,
but it looks like yours isn't. Just find the nearest brush you can which is
bigger and plane it down. Use a coarse file, not any sort of sandpaper or
emery paper.

N