About a week and a half ago I purchased a Dahon Eco 3 7 Speed Red for 270.00 plus tax on sale at Performance. Its made in China which concerned me, but I have ridden it a lot so far and its fine--seems well made for a folder. Its a lot of fun having that upright see and be seen position on the bike. I ride it near the beach a lot. The aluminum seat post has a very slow slip that I need to do something about. I tightened the clamp but it still slips about 1/4 inch every 30 minutes it seems. Any suggestions on this would be appreciated.