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This review is from: Manfrotto 236 Spiked Foot For Monopod (Accessory)
although stated as compatible with the manfrotto monopod range this product will not fit unless you modify the existing rubber foot of the monopod.
removing the foot is pointless as there is no way that you can tighten the spike at all.
shaving the rubber foot with a sharp blade is the only option to obtain a "secure" fit. even then there a great chance of the spike slipping off when lifting the monopod from the ground.
the best option would be to drill a hole through the spike and end section of your monopod and bolt the item in to place.
however, when fitted securely this product works rather well! strongly built, quality construction.