I have an older Nacra I20 and am having a problem with the holes in the mast for the rotator arm becoming slightly elongated. anyone done a repair with this?? I plan to rivet on a stainless steel plate onto the outside of the mast to reinforce this area and keep the holes from elongating more. thoughts??

Also, does anyone know what the bolt is for below the rotator arm?? someone once told me, but my memory is lapsing a bit... Thanks.