Long-time lurker, now officially "outed" here, so thanks for the welcome.
Yes, the Manfrotto was out of its depth and that was an expensive lesson for me. This was my first time using the lens on it and I was really just "playing around" in the yard so didn't think it through very deeply. Ironically, I had been researching better travel tripods just that morning. It handled my DA* 200 well enough, and while the 60-250 is bigger, it didn't strike me as *that* much bigger but it's certainly less balanced when zoomed out. I suspect that if it hadn't been zoomed out, the lens may well have survived the fall.
@stevebrot, thanks for suggestion on C.R.I.S. I will contact them. Even if a repair costs several hundred $ that would still be better than junking the lens.
@kiwi_jono, I had to keep the cursing to a minimum since my mother-in-law happens to be visiting, but I couldn't stop myself from moping around for several hours afterward!
(where's the crying smilie?)
On the bright side, the K-3 proved tough enough to handle the fall with no visible damage. Tried some test photos and can't see any issues but I'll do some more rigorous testing before I pronounce that safe. But, that is why I went Pentax in the first place and I've bumped and slopped my previous K10 and K5 over many miles and many cities without any issues, ever.