otherwise it'll be loose and slide up and down the column(not good). The rubber ring is a tight fitment, meanign that it needs to be stretched over the centre column to fit tightly. Many/any hardware store should have something similar to suit. The inner diameter of the rubber ring is 24mm and the other diameter is 30mm(hence a 6mm thickness in the rubber). I use them for resealing leaky taps and sometimes in automotive repairs etc. I have a rubber O ring kit that has hundreds of different sized rings of various thickenesses and I think I paid about $5 for the kit at a junk-hardware shop. The rubber O ring is extremely cheap to acquire. What they appear to do is to cushion the top of the column from a metal to metal hard impact when you collapse the column, and hence likely to stop wear from a metal to metal surface conjunction. I'm looking at both my Manfrotto tripods(NOT HEADS!!!) and there are rubber rings tightly located at the top of the extension column. I doubt that Manfrotto have made such a hefty metallic retaining ring, so my theory is that it's a rubbery ring used to protect or soften something. Less likely: it's it's made of metal(possibly still flexible, but very little springiness) then it may not be broken, and could be a circlip/retaining ring of some type.
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