The seal where the driveshaft enters the gearbox is leaking on my pre-alfa outdrive. I had a "mechanic" replace the seal this past Spring. He said that the shaft was grooved and the seal would leak; he was right. I pulled the outdrive and the bellows was full of gear oil. On the tractor board I frequent, someone had mentioned a commercially available sleeve to go on seal surfaces. Anyone hear of such a thing?