I've been using an anvil looper approx. 24" in length but the blade is
now very dull and can't be easily sharpened, nor replaced.


There is nothing difficult about sharpening this tool.
It can be done with little more than 220 grit silicon carbide
sandpaper glued to a wooden paint stirrer.
Some are even soft enough to file.
A scythe stone would be good too.