Why is there no washer with bend down tabs on my 2008 250 Pro XS. Every motor I have ever owned has had one. I bought the boat in May and decided to change the lower unit oil. The nut and washers were so black that I never noticed that it didn't have one. I also noticed that the threads on the prop shaft were bent a little on the end and little shavings of brass came off the nut when I removed it. Do you think it would be wise to try and get a new nut? I tightened it as much as I could with my plastic prop wrench. Is it possible to get it tight enough with this wrench?