Mike,
Who were bought out?
After posting I noticed from both Mfr. websites that Helium are just showing "Out of stock" and Muddy shows "Available spring of 19'."
True statement by sloinsteady:
"Just an FYI guys, it is very rare to be able to see a defect in metal unless of course it is a surface crack. X-rays or mag particle testing will be needed to identify subsurface cracks, voids or porosity in castings."
I don't think from the pictures shown without seeing closeup view of the broken piece that there's oxidation and sign of an earlier break. May just be the way the piece sheared when it let go.
Something else for everyone to keep in mind is your stealth tape possibly covering up potential wear and flaws. Probably a good idea to strip it each year to inspect them and reinstall new, or stick to camo paint.
Can't help but wonder if this stick was always used as his bottom stick, and if he may have been in a habit of installing it low enough on the tree to be able to "hammer it" with his foot, rather than just a solid push down with a foot to set it?