I noticed that my gas tank moves about 3/4" when I lift it in the rear as it pivots on the 2 front attachment bolts. A couple of questions. - Is this normal? - What is the exact location of the rubber bumper underneath - could it be slid too far forward - is there a correct position for this? - it looks like it is too low as the suspension adjustment nob on the right side is slightly touching the tank (which I believe is not normal. Lastly the little rubber strap holding the tank broke - they want $14 for a new one - any tricks for replacement? thanks.