FWIW, M122 is the designation of the M2 tripod for the M60; M3 of course is for the M2HB. My guess is that the flanges marked M122 and M3 respectively are centered on something on those tripods, and this is a riser adaptable to either tripod.
You rotate the device on the tripod head, facing the appropriate marking. This is because the tripod heads are different sizes.
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