Hi I just wondered if I could have some advice from the more experienced. Everything went fine, but the bolt that secures the cistern to the toilet is leaking. Do I continue to tighten it up in the hope that it seals? Do I replace it with a metal one? Oddly the base of the nut is not flush with the surface as you might be able to see in the photo. Maybe they have an angle designed into them and I didn't notice. I used sealer too! Thank you..