Gilliane,
On Flamingo the shock cord reappears near the spreaders, if this is the case you can attach some new shock cord and pull it through. I discovered this after I had riveted a new loop to the mast near the spreaders to attach shock cord to. I have a length of thin rope attached to the top of the keel, this is tied to the shock cord and marked with a plastic ball. When the keel is down the ball is at deck level, however far up the ball is indicates how much the keep is up. I think there are as many ways of doing this as there are 275s.
Regards
Phill