Originally Posted By: mr_diy
I believe the dent is just evidence of a fairly high drop on the end of the filter. The weight of the filter element hitting the against the leaf spring is what fatigued, deformed, or stretched the leaf spring so it no longer was providing the necessary pressure to hold the element tight. A coil spring likely would survive such a drop. Someone could test this by dropping a used and empty filter to see if it loosens up and allows the twisting action to make the noise.
Yes, this. It's not the dent as much as the impact and what happened inside (the leaf spring was overstressed), the Ultra is a heavy filter. The dent just lets us know it happened.
I believe the dent is just evidence of a fairly high drop on the end of the filter. The weight of the filter element hitting the against the leaf spring is what fatigued, deformed, or stretched the leaf spring so it no longer was providing the necessary pressure to hold the element tight. A coil spring likely would survive such a drop. Someone could test this by dropping a used and empty filter to see if it loosens up and allows the twisting action to make the noise.
Yes, this. It's not the dent as much as the impact and what happened inside (the leaf spring was overstressed), the Ultra is a heavy filter. The dent just lets us know it happened.