On my H-27 the jib halyard comes down to the base of the furler and is tightened down with a knot attached to a shackle. The luff of the jib is loose and needs tightening. Taking up on the knot then trying to reeattach the shackle is a struggle and so far has been unsuccessful. I have thought about using a turnbuckle but reading in catalogs it looks like these are intended for shrouds and lifelines. Any ideas out there? Thanks