I replaced one knob, which looks different from the other ones (see picture), but is an original Manfrotto part. The tripod itself shows minimal signs of use. The tripod was mostly used indoors for still-life work.
Manfrotto tripod / MT290DUA3-PF290 DUAL Alu 3 section tripod with 90° column
Tripod Mount Manfrotto Tripod and one std mount
MANFROTTO TRIPOD / MT290DUA3-PF290 DUAL Alu 3 SECTION TRIPOD 90° COLUMN
Manfrotto Tripod With Fluid Head - MVH502AH & 055XPROB
Manfrotto Tripod With Joystick Head And Clip For Camera
Vinton Pro Touch PT350 by Manfrotto Tripod Legs