The R190.311 Assembly Knob from Manfrotto is a spare or replacement part for select Manfrotto tripods. A spring and washer is included with this knob.
Spare or replacement part for the following tripods: 055A, 055AB, 055BWB, 055CL, 055CLB, 055D, 055DB, 055MFV, 055NAT2, 055NAT3, 055SSB, 055V, 055WNB, 190CL, 190CLB, 190D, 190DB, 190MFV, 190NAT2, 190NAT3, 190PRO, 190PROB 190PROBWORLDCUP, 190SSB, 190V, 290NAT3, 718B, 718SHB, 719B, 755B, and 756B
