I have a 111w155 that I believe has been converted to large bobbin ( size U 28x11mm not the m size), need to replace the hook, from what I can find out I believe the correct part comes from a juki LU-563 , part no.B1830-563-OAO or B1830-563-BAO , they both look like mine, mine has the tang on it, but uses the "U" style (28x11mm) bobbin , the parts I looked up say the use large "M" bobbin , not the "U", something is not adding up, any help would be great , thanks