ernst
You can replace the clamp in situ.
Some types of clamp can be re thread by gently pushing the free end into where it belongs and turning the screw. Take the clamp off and see if you can get this to work.
This is easier to do if the clamp is a tad longer than it needs to be. The clamp(s) you have now are probably a bit to short and one sprung open because there is not enough clamp material being held by the screw. It looks that way in the picture to me.
TRUE GRIT
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