Sometimes while pedaling, on the drive side pedal on the downstroke, I can feel a bit of play; not sure how else to describe it. Took it to the lbs a few weeks ago, and the mechanic tightened the pedal where it screws into the crank arm, checked the bottom bracket (it was ok), and tightened the crank. I've tried it with different sets of pedals and that's not it. Thanks in advance for any suggestions.