Canon 500mm f4 mk ii tripod collar

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JJ2015 New Member • Posts: 3
Canon 500mm f4 mk ii tripod collar

I've just purchased a secondhand 500mm mk ii.  I took it out yesterday and noticed the tripod collar is not tightening.   Can someone please help and tell me how to tighten it or remove it.  The little knob on the collar will not move.  There seems to be a lock device under the plastic cover of the knob but, I can't see how to adjust this!

TIA

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