Only once have I ever encountered a glue bump on a TGN finest. A 26mm should fit perfectly, but as @bakerbarber mentioned, "you never really know until you have one in your hand." I routinely put a 24mm knot in a 25.4mm hole (1")
I'm thinking the same, pretty sure I could make it happen. They haven't responded, so I sent another email.A 26 should fit and if not it should take minimal effort to enlarge the hole what little would be needed.