Inquiry (采购产品): messed up middle wheels the center connection link-pivot machanism is not working. the middle wheels wheels stay in contact with the the floor when ever you want them to raise. and the front wheel mount appers to be bent. we need to get infomation to fix this problim. it was manufactured in 9-2005 it is the 12 step standred modle. contact me at 1-660-221-5926 my name is Tyler Mazurek thank you **** Hidden Message ***** Tyler Mazurek 65355 USA Company: valley discount Phone: 660-438-5597 E-mail: tyler_12_maz@yahoo.com **** Hidden Message ***** tyler_12_maz@yahoo.com