I swapped tires on my bike today and after snugging up the rear I noticed that the side weren't exactly equal for the chain adjustment marks. While attempting to take the nut off the right side the axle spun in the left side chain adjuster spacer until it could spin 360 in it. I now can't get the nut off. I've tried breaking i loose but can't do it. Please tell me someone else has had this problem. Any suggestions???