Ok guys I have a 91 mercury 2.5l on my 190 champ. Per multiple people they have recommended a Yamaha 25m prop. So I did some trading from a trophy plus to a 25m and now I’m trying to figure out what hardware I need. The prop has a pressed in rubber hub now that is flush on the bottom and is recessed on the top side. So do I just need the mercury splined washer and lock or do I need some type of a thrust washer on the bottom as well?