Thanks, Tom. When I added 160 to my SB-200, I ground a gap in the band on the stock Heathkit plate choke -- thinking that it could be a problem-- at the same time that I added another choke in series with it. Then I super-glued it to the ceramic rod.
I'm sure you've seen this method of winding:http://www.w0btu.com/files/misc/Gates%20plate%20choke.jpg
That Gates plate RF choke will likely go in my amplifier, if I ever get motivated. :-)