i have a 40 yr old boat
with original cranse irons.
none is stretched. mizzen, main, sprit--allstill round. stretching would warp the shape so no longer round. this is some hefty stainless we talking here. same thickness as my newest chainplates, slightly thicker than my original to boat
all are individually created out of stainless and the only ill fitting appearance is due to shrinkage of wood inside the iron.