Did you mean to say "removal of the original filter"? Because when I got my Freewell Pola/ND set a week or so ago, the protective filter on the 6K camera seemed so tight I couldn't be sure it wasn't superglued/loctite'd on there. Like the OP I too didn't want to slip and tear a gimbal mount by applying too much pressure. After I consulted with other Autel Pro II 6K camera owners on FB that the filter was not in fact glued in place and that with enough persuasion and grip it could be removed, and that it was worth the trouble for the ND filters provide, I found an easy solution with materials at hand. Turns out that a medium sized zip-tie of about 8" length and 3/16" wide had just the right pitch to the teeth that when I snugged it down around the Autel filter ribs, then doubled it back in my hand it gave me enough leverage to get it loose. I was prepared to make a filter wrench if needed (they once made these things and these might be found new online still) but this was much quicker than waiting for a delivery