So my trusty 98 Jamis Dragon has developed issues with the seat tube. My seat will no longer stay up, thats right, I have problems keeping it up. There are no obvious cracks in the tube or around the seat bolt binder area. Can the collar area have stretched out? Bolt is in one peice, nothing else seems amiss to my non framebuilding eye, although there is a strange line around the collar area, inside the seat tube, about a quarter inch down. Any ideas? If it matters, it has a Thomson post in it, and a bolt, not a QR. Anybody? Bueller? Bueller?