Here is a follow-up summary of this thread with included Loctite suggestion:
- Posters recommended mostly
- Really Right Stuff Foot for NIKKOR Z 70-200mm f/2.8 VR-S Lens (and 100-400)
- Hejnar foot for Nikon Z 70-200/f2.8 S VR
- Kirk LP-70 Lens Foot for Nikon Z 70-200mm f/2.8 VR S & Z 100-400mm f/4.5-5.6 VR S Lens
- Cheapest of them all is Hejnar
- Replacement foot using screws tend to loosen and need at least random checks to see if they are OK
- There is no reported difference between more expensive RRS foot and cheaper Kirk LP-70
- Nobody commented on Leofoto NF-05 Lens foot
- Those preferring fixed foot are recommending Hejnar
- Those having no issues with the one with a screw recommend RRS.
- Loctite Blue 242 recommended for extra safety if using the foot like RRS or Kirk