AH man this is pissing me off. I have profiles and really like them but the bolt that holds the spider on keeps coming loose the cranks are made of cromoly... its a really strong metal most of u know and when tightening the bolt u don't get a tightening fell it just spins freely and then stops. I have tryed medium thread locker but it doesn't work well. I have to tighten it every ****ing three hours!! anyone?