That's what I'd do, as well. But I'd suggest Loctite Blue because if it doesn't work you'll want to be able to remove it!Originally Posted by Joel Eade
I think, before buying a new foot, I would remove the foot and put a some Loctite on the four small screws in the base and tighten them down....might correct the problem
If that doesn't work... I use RRS replacement feet on my EF 600/4 II and RF 100-300/2.8, they made one for the EF 100-400 II but it's gone from their website (more broadly, their product selection has shrunk considerably in the last few years). The RRS foot is still available at B&H/Adorama, but it's $30 more than the Kirk foot. OTOH, if you're not opposed to used then KEH has the RRS foot for $68, and since it's a chunk of machined aluminum there's really not much that can go wrong. FWIW, for my R8 I bought the RRS L-bracket for the EOS RP (which fits perfectly) used from KEH and it was in perfect condition (unlike the foot for the 100-400 II, the RP bracket is not available new anywhere I could find).
Good luck!
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