I was even comparing the two free-wheel bodies by eye and going on to my brother how they were exactly the same length, 'go on, you look, you look, see?'. Reckon it may have occurred because a non-mechanic did it (my mate Giles) who I told that the hub was 10sp and the cassette was 11sp but should fit, I reckon he tried it once, it didn't fit and he didn't persevere because he didn't know they 100% should be compatible.
I was even comparing the two free-wheel bodies by eye and going on to my brother how they were exactly the same length, 'go on, you look, you look, see?'. Reckon it may have occurred because a non-mechanic did it (my mate Giles) who I told that the hub was 10sp and the cassette was 11sp but should fit, I reckon he tried it once, it didn't fit and he didn't persevere because he didn't know they 100% should be compatible.