I don't shackle the jib to the chainplate anymore. I rig the jib so clue is well below that point and I turn the chainplate around so the tab does not interfere with the jib. I've seen some folks put a large shackle on the clue and around the chainplate. This works well if you've rigged a system to adjust the jib luff tension. I'm a set it and forget it kind if guy, yeah I know, the top guns do it but I'm pretty sure an adjustable jib luff isn't what's keeping me from the top.