An extensive validation activity has been conducted since year 2007 for the coaxial Blade Tuner for TESLA SC cavities. During this activity, performances and limits of prototype models have been deeply investigated through detailed test sessions inside CHECHIA DESY and HoBiCaT BESSY horizontal cryostats as well as F.E. modelling and analyses. The result is an improved design for the Blade Tuner, specifically meant to satisfy the incoming ILC level performance requirements, fulfil pressure vessels regulations and keep Ti S.S. material compatibility. Recent Blade Tuner activities and results will be presented in this paper in view of the installation of 8 units in the second cryomodule of ILCTA New Muon facility at Fermilab, and also of our contribution to both incoming S1 Global KEK and ILC HiGrade projects. The manufacturing process of the first set of 8 tuners, from production to room temperature validation for the whole series, will be also reviewed. Then the incoming cold test will be presented. Special effort has been made in evaluating the accuracy and repeatability of fast and slow tuning action at few Hz range