Hi , I was just removing my lower leg, and when the driveshaft came down there was a torn O ring around the top of the drive shaft like it would be in that little groove up there , Ive never seen an o ring there before and didnt see one on any BRP litterature i have?? Iv e havent seen this on my other 2 Evinrudes???? Anyway is it suppose to be there or not?? Thanks!!!