I specified 1 inch without actually measuring. It turns out that smaller and
larger are available, not 1 inch. No matter though smaller is actually
better (theoretically, you'd never know the difference though).

"Mark S. Holden" wrote in message
...
http://www.kc7nod.20m.com/new_page_1.htm

I recently bought over 100 #43 ferrites that are a little smaller than the
one in the plans, but they work fine. If you need one, contact me direct -
I'll sell you one for a buck postpaid.