Like a few others who have mentioned above I’ve also been interested in square filing, Lenny of info on the web and YouTube with a good video here for those who have a grinding machine.
https://youtu.be/vhwMzna3n5c
As it was a bit of a wet day I followed the instructions on the video and modified a slightly worn chain.
I’m happy with the results but need to get out and test it.
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