I recently bought a used 1981 laser (serial ZFS) and the hull takes on quite a bit of water when sailing. There is a bit of hull separation at the bow, but not terrible. The mast step also looks okay. The culprit appears to be the cockpit drain, where there is some obvious separation. I'm interested in trying to repair but not sure where to begin. Can I repair with a filler such as West System 610? I noticed that there is no brass sheathing for the plug. Is this normal for a boat that age? Should I attempt to modify the plug? I included a couple photos. Any suggestions welcome. Thanks!