Buddy of mine has a Perazzi O/U and the center rib between the barrels is separating from the lower barrel. I remember reading an SKB flyer that talked about keeping powder solvents off the out union of the top barrel and the rib as the solvent would attack the glue holding it on. This does not look like it was silver soldered in, so perhaps glue? My thought is to try to clean the oil out of the union (with a degreaser that does not further attack the adhesive???? Any thoughts????) and let capillary attraction suck one of the tightbond / loc-tight adhesives into the union. Anyone run into this??? My bud indicated that it is not uncommon on Perazzi's.