My 87 suburban's tilt column will skip down if you put a good bit of pressure on it such as when getting into the truck. I've already had the column apart to tighten the four bolts (thanks to capt chaos' awesome pic demo) but it had been doing this before that! Everything seemed ok inside,nothing broken, but something must be worn? Possibly the spring that gets held in with the slotted cap doesn't have enough tension? Any ideas? I searched but couldn't find anything relating to this, thanks.