I have recently acquired some cinelli gilco bars and a guerciotti stem. They were on a Miyata 610 i picked up. I haven't seen anything like this before does anyone know anything about them? Also the stem is Cinelli the clamp bolt is underneath and there is no opening to provide clamping action so i don't know how works. I have taken the bolt right out and there is no movement at all. Again anybody have any ideas?