Hi everyone...great site here! ..Hoping if someone can kindly tell me if my radial is a mk v or mk vi.It has blue corners-no extra white patches on corners and has '5.7' written on the window. Seems to have rather tight leech and suffer from foot flap occassionally. Also , the distance from tack grommet to boom is more than full laser sail...seems harder to pull on cunnham as well....is this all par for the course?.....thanks