I put a little tiny bit of vacuum pump grease on the threads on mine. I've seen it used as anti-seize elsewhere and had some, but vaseline would probably work too. No sense in your grip getting stuck if it can be helped.
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My machine is getting older but It doesn't sweat over the 22mp 5D3 files a bit, Does it take alittle longer than LR3? It doesn't feel like it to me.
It surprises me to hear such systems having problems with LR4.
You can do this in light room in bulk, look for some tutorials to show you