Lately, every 10-20 miles, my seat is inexplicably loose enough to pop up a notch and rack me. Every time I adjust it back down and torque it in as tight as I can. I'm just commuting, nothing extreme though I am a Clyde and have the seat all the way back as that's the most comfortable riding position for me. I'm never even doing anything interesting, just minor acceleration. Is there any tricks to keep it tightened, or do I need to find someone with a welding torch or something?