I'm getting ready to do change the water pump impeller on my Alpha 1 Gen2 drive. I've found a lot of good info on this board and have reviewed some videos on the procedure. It looks straight forward enough. Parts are on order. The one thing that is not clear is how important the alignment pins are. I see a number of references that show using the alignment pins. I also see articles and videos that don't use the pins. How many people have done impeller replacements without the pins and did you have bad results from that?