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Cross-posting this question on my 8mm derivative:
I printed these out (they were just what I was looking for) but I can't determine what to use for the retention nuts. Standard M5s do not fit, nor do t slot M5s that are used in 20mm extrusions."
The slots for the nuts are sized 8.5x3mm and indeed fit neither a M4 nor M5 nut (ISO 4032),
while a M3 nut will be too loose to tighten down. They would fit slim M5 nuts (8x2,7mm, ISO 4035/4036). What size were they intended for?