I bought some aluminum wheel sets that are AJ's w/threaded axles. These wheels wobble around like a lopsided ball. I have been unable to get them straight. Checked axles on a piece of glass and they are straight, tried adjusting the position on the axle and jam nut but only get a slight improvement. The front wheels are press on type and have the same problem. Are there any secrets known to correct this problem or maybe just defective. Any help would be greatly appreciated. To make things worse I paid way to much money for these.