HELP the creaking is driving me nuts! I have greesed the seatpost, tightend skewers, and determined that its comming from either the lower piviot or cranks. I dont think its the cranks or the upper piviots. I do have a tiny bit of flex at the lower piviot but i can not tighten it any more because it feels like the the hex bolt head is gona strip if i tighten it any more. My bike has over 1400 miles on it. Do i need a piviot upgrade or replacement?