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Look at the drawings and decide, to me it looks like it won't work because the lock bolt head of a 540 will interfere with the main body of a 520 before the pedal axle assembly is fully home
https://si.shimano.com/de/pdfs/ev/PD-M520-2235/EV-PD-M520-2235.pdf
https://si.shimano.com/de/pdfs/ev/PD-M540-2234/EV-PD-M540-2234.pdf
Are the axles (without the spanner flats) from a Shimano m540 or similar pedal a straight swap into an m520 body? I've got two damaged pairs of pedals I'd like to combine.