of shapes according to the illustrations of fig1 and 2 the cutout 8 is created directly in the turbine blade platform 4 that means that the cutout 8 is located entirely behind the lower outer edge 16 of the turbine blade platform 4 or behind the lower outer edge 16 of a web 17 running from the rim region 14 to the rim region 15 of the turbine blade platform 4 and in particular terminates at this outer edge 16 in this context the cutout 8 is at least partially at the same height as and thus directly u2014 as seen in the axial extent 12 u2014 axially next to the insertion slot 6 into which the seal plate 7 is inserted in the case of proper assembly according to the illustrations of fig3 to 5 the cutout 8 is created in a material accumulation 20 additionally affixed beneath the turbine blade platform 4 in this exemplary embodiment the material accumulation 20 is located radially beneath and axially next to the insertion slot 6 such that the turbine blade platform 4 is not weakened structurally by the cutout 8 a the material accumulation 20 is a raised portion which is present partially beneath the turbine blade platform 4 and is spaced apart on both sides from the rim regions 14 and 15 by a distance 21 and is thus not to be mistaken for the web 17 running on the underside 5 of the turbine blade platform 4 continuously from the rim region 14 to the rim region 15 or vice versa the respective distance 21 here illustrated and numbered only by way of example between the material accumulation 20 but also between the cutouts 8 or respectively 8.