Hey everyone, I've noticed that the BB on my road bike, which I believe is an older Schwinn, has some play to it. The axle (wrong term?) that the cranks anchor to wobbles around. Every fastener that I can see is tight. Does this mean I need a new BB? And, most importantly, how do I go about finding the right replacement? I'm looking to buy something cheap, most likely used on ebay. What should I measure/check on mine to make sure I'm buying the right part? Basically any info would be helpful. Thanks in advance, these are really great forums!