Hi there,
Long story short... this is my 3rd time to drop the camera from near 1m high, this time not my fault but a bad sling belt, the metal hook thing got loosen out.
The lens in use was the 55-300 HD with plastic filter threading, amazingly it does not break or crack even the metal hood seriously deformed, the filter also in prefect shape, last time I used the original plastic hood when I dropped it, the whole thing bounced and rolled on the floor caused some dent and scratches on the body. Since I lost the hood I replaced with a metal one, in fact, I used all metal hood on my lenses, I believed this can better protect the lens, just like a well designed car, it will sacrifice to protect the driver ! I use hood on my lenses all the time not only to protect the lens when bumping around, also blocking my finger from touching the glass and smudged it, I find this is the main reason I got blur and soft image !
Interestingly, last time I dropped the camera and the zoom became stiff, this time I dropped the focus ring became stiff but zoom freely, so I believe the gear inside the lens has not break but shifted out of place, the problem is not serious the lens still can focus well, so I will keep it until I've the fund to upgrade, after all Pentax is exceptionally well built, you can't find any other made at this cost with such high quality !