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wintyDono
Just want to mention that I believe you might actually not have a complete 631 Starfish here, but the later 632 model non d/s arm together with a 631 d/s arm. It's just that I understand that the 632 arm has almost v-shaped gaps inbetween the spider arms, plus incised sections in four places on the reverse side. Of course, I'm only really mentioning this because I have an odd set also and thought maybe you'd like to swap one of them for one of mine, especially as I'm pretty sure only one of your cranks would have the slight bend in it which I believe is pretty obvious on the non d/s crank but not on the other.