Prop is said to be (by Volvo dealer service guy) only size offered for my saildrive MS25S with 2.2 gear ratio (55HP Volvo engine). He insists the spacer is proper and speculates the spline has "come forward" to cause the gap. I don't think so since the gap appeared when the new prop was installed 1.5 years ago. Ran fine for all this time but I am bothered by this gap. I think a "long hub" prop would restore the situation but he says not available in his computer choices. Old prop had no gap, shown by picture. Is this problem known to anyone???
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