I have the original MB-D12 battery grip on my D810, and all works fine. However, it seems to come loose after a few hours of usage... I tighten the attachment wheel, but eventually it will come loose. I have tried really putting some muscle into the tightening, and I am afraid that if I try even harden, something will break.
Does anyone have a suggestion as to what I could do? I thought about using some RRS threadlocker fluid, but I do take off the battery grip from time to time, if for no other reason then to charge the internal battery...
Genuine Nikon parts work to a fine tolerance, and doing any kind of work has described would invalidate the warranty assuming it was in the warranty time scale.
I even have a grip from a D7000 on my D800 which does its job of carrying 6 spare AA batteries for my flash ( connector removed ) 5 min work with the angle grinder but no expense. Profit and function is No 1
With thread locker I would be worried you would not be able to put sufficient force on the tread to undo it .usually heat is used to destroy the threadlock.
Personally I just take out the connector and use them as dumb battery carriers then I can have no problems ....