We give some new examples of smooth 4-manifolds which are diffeomorphic although they are obtained by Fintushel-Stern knot surgeries on a smooth 4-manifold with different knots; the first such examples are given by Akbulut . In the proof we essentially use the monodromy of a cusp.
AKAHO, MANABU (2006) "A Connected Sum of Knots and Fintushel-Stern Knot Surgery on 4-manifolds," Turkish Journal of Mathematics: Vol. 30: No. 1, Article 8. Available at: https://journals.tubitak.gov.tr/math/vol30/iss1/8