I need to lube the seal on my X fusion dropper post , USA tech dept says its Ok to take it off & grease, but I cant get any purchase to unscrew it. Its about 30mm dia. and a smooth anodized surface. Have tried a pipe wrench and tyre bodge but no shifty. Any ideas of using general things around the garage ? Don’t really want to use the vice for fear of crushing.
It’s the red bit-

