I have a 51 Rapide that is leaking oil where alternator face fits into primary chain casing. I recently picked up the bike after having it restored by “ someone”. He said the alternator face is smaller then the original ones used ,so I needed to make a plate to go between alternator and case. So that is what I did and yes noticed a gap as a took items apart. The plate seems to have worked for awhile but now have oil dripping again. Anybody with experience on how to solve this leak ?