I have written an article about re-hackling flax before spinning. Together with the article there is a performance about re-hackling flax before spinning:

You can find the article here:
Ekstedt Bjersing, M. (2023). Re-hackling flax before spinning: Using questions as a method of understanding. FORMakademisk, 16(4). https://doi.org/10.7577/formakademisk.5391

I have also talked about hackling at a Nordic webinar: From Flax to linen – retting, hackling and tools for flax preparation. October 15th 2024.