I am a long time fan of the Singer buttonholers because they make exact buttonholes everytime and you can adjust the width to accommodate thick buttons. I was disgusted with the buttonholer on my Janome 6500 machine because it wouldn't handle thick or large buttons. Guess what? My ancient old Singer buttonholer that is older than I am will fit my Janome machine because they are both short shank machines. Just lower your feeddogs on your Janome, attach the buttonholer and long wide buttonholes are yours! It even makes buttonholes in denim and upholstery fabric for my bags without complaining or bunching. I am in love with my buttonholer!