Eamon:
One trick I have that works really well on bread knives that have round serrations… I have a 1/2″ diameter white, ceramic “crock stick” which is about 8″ long (have had it for maybe thirty years). I chuck it up in a 1/2″ cordless drill, clamp the drill in a vise, then work the individual serrations/grooves over the spinning rod. Pretty easy to hold the right angle or to play with various approaches to bring up a very nice edge. Moving the blade along the length of the stick helps to spread the accumulation of swarf. Use a “super eraser” to clean the stick while it’s spinning.
Lansky still sells the “crock stick” set with 2 med and 2 fine grit stones for $16 at http://www.amazon.com/Lansky-4-rod-Crock-Sharpener-LCD5D/dp/B000B8FW0E/ref=sr_1_cc_1?s=aps&ie=UTF8&qid=1398322593&sr=1-1-catcorr&keywords=crock+stick
I’m not sure what the diameter is – maybe more like 1/4″, but it looks workable.
There’s an awful lot of ceramic rods for sale on Amazon, but they don’t say what the grits are.
Good luck,
Tom