Earlier this year I guess I decided to see how bad I could tear up my prop on a sandbar. Well in the process it also took a chunk out of 1 fin and peice of the prop lip on the lower unit. The insurance company ended up sending a check to replace the lower plus a little extra.. My mechanic said if you really had to you could replace the lower but he would run the outdrive until it dies. He said the missing chunk does not affect the drive at all. For me, it more of being OCD and wanting a new lower unit. I showed him the ad for the SEI's and he said no they are chinese and worthless. I could replace the entire outdrive, rams and still have money left for the cost of a Mercruiser Alpha one lower.. I need some suggestions..... Or even would you put $2000 into a boat that was only $3000 when I bought it?