You’ll need a Shimano TL-PD40 It’s the gray tool that fits the notched axle of the 520.
Image courtesy of web search.
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GP lama put out a hack video ages ago for converting them to mtb pedals
To be fair the post you replied to was from 2019, before @themagicspanner and @madmaximummodulus pioniored the mod and before gplama read about it in this thread 
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Not to mention, I seem to remember Shane pointing to this post as the idea source of his experience in the first place
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Please note that the recent discussion here is regarding the Shimano Duo spindles, not the original ones. Don’t want folks trying to put Shimano pedal bodies on the original Favero pedals
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Is there a new version of the Favero out that uses different spindles?
For a few months now. Eventually they’ll probably offer a legit SPD pedal but there are options for other Shimano bodies that fit beyond the list they have. 
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Neat, thanks.
Thank you so much! I just did this hack and it works just fine 
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Congrats on the conversion!
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Just got my favero uno pedals, and bontrager comp spd’s, and am shocked how easy it was to swap over. Also, no clearance issues with my shimano xc5 shoes. Looking forward to getting some rides in with them!
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Hmm not sure why a post that old came up in my feet! Is favero going to make some mtb pedals - anyone know?
Related to this, does anyone know if there are any pure flats that will work? The new PD-M8141 or PD-GR400 for instance.
Have had the Uno since Dec 2019. Never really liked Look Keo pedals but I’ve tolerated riding with the left side Uno and the right side SPD all this time. Finally got around to doing this hack with the Xpedo M-FORCE 8 after seeing the YouTube vids. Would’ve gone for cheaper pedals if I found this forum prior. After 80 miles worth of rides, no noticable difference from past measurements. No need to trim my Giro Carbide R II nor Fizik Terra Powerstrap X4 shoes in size 42.5 EU. Loving it!
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Pretty thin?
“Fixed Minor Bugs” 
Must have been a slow year for the Favero software team.
Agree, although i wouldn’t be at all surprised if any official SPD pedal was just an assioma-Shi length spindle with and xpedo produced pedal body.
I personally don’t think there is any point favero releasing a new power meter until they can get rid of or greatly reduce the size of the pod - they are pretty much perfect other than the pod.
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I did the v4.80 update about 8 hours ago.
This is one of three different SPD pedal bodies that have worked nicely on the Duo SHI spindles. It’ll be great if they adjust the spindle to use current XT or XTR pedal bodies for what they have in the works.
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Is that a 540 or 520?
They are 520s. I’ve also helped other riders convert a pair of 530s, EH500s and doing a set of A520 for the gravel bike. The old the M737 even work.
The Shi spindle’s additional width eliminates the need to cut into shoe soles as that width is between the pod and cleat centerline.
Bold face are SPD cleat pedal (click to link below to get the list for in more reader-friendly view)