Please, no rips on bike quality. 1yr old schwinn trailway bike. Not my bike. Bottom bracket is loose. Or specifically, the crank axle feels loose thru the bottom bracket. I took off pedal crank arm. Took off lock ring on side opposite chain ring. The "cone" nut is shaped like a "double D". It has approx 16mm flats. I do not have the special wrench a mechanic might use to remove the cone. I do have 2 separate 16mm wrenches and I am using both to try and loosen the cone nut. It will not budge. Should this cone turn with no lock ring installed? Sorry if I refer to this adjustable nut as a "cone". Since I cannot remove it, I cannot see beneath it so I do not know for sure if I have a caged bearing or sealed bearing.