In Standard English, we cannot have a fuller in a blade unless it has been created by the process of stamping with the tool of the same name.
When we scrape a fuller-like depression in a blade we are sculpting the blade, not fullering it.
However, this is pedantry, and it is probably acceptable in loose colloquial usage to use "fuller" to describe a fuller-like depression, or similar feature.
The example shown in this post is a keris blade that shows multi "fullering", both with and across the grain of the metal. The way in which this is done is not by use of a jig, but by scribing the outline of the feature, and then cutting that outline with cold chisels. In a deep depression the bulk of the material is removed with chisels and gouges, the surface is refined with scrapers, refined further with files, and then polished. Using modern technology the polishing can be done with wet and dry paper, but powdered terracotta mixed with water is also a very effective polishing agent.
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