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By large bit do you mean the part that the RIS screws onto (it also has holes running through it at regular intervals)? I tried using a Husky wrench (with a towel), but it didn't budge. I even heated i up to see it it was loctited, but to no avail.
I'm also worried about applying too much force and snapping the upper.
EDIT: What do you mean by plumber's wrench?
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