A method for making a blind hole in a prefabricated tire , the method comprising - arranging available ∘ a prefabricated tire comprising tread blocks forming the tread of the tire , and thereafter - drilling such a blind hole to a tread block of the tire that the blind hole has ∘ a first cross section (C1) at a first depth (de1) and ∘ a second cross section (C2) at a second depth (de2), wherein - the second cross section (C2) is greater than the first cross section (C1) and the second depth (de2) is greater than the first depth (de1) and - the material of the tread block has a Shore hardness of from 50 ShA to 80 ShA, according to ASTM standard D2240, version 15e1, at a temperature of 23 °C, the method comprising - using such a drill bit that comprises a shaft extending in a longitudinal direction of the drill bit , wherein ∘ the drill bit further comprises a protrusion , such as a flange , radially extending from the shaft , and the method comprises forming the second cross section (C2) of the blind hole by using the protrusion of the drill bit , and/or ∘ a part of the shaft is configured to radially expand in use, the method comprising forming the second cross section (C2) of the blind hole by using the radially expanding part of the shaft , and/or ∘ the method comprises forming the second cross section (C2) of the blind hole by arranging a longitudinal direction of the shaft at various angles relative to a normal (N1) of the tread . - arranging available ∘ a prefabricated tire comprising tread blocks forming the tread of the tire , and thereafter - drilling such a blind hole to a tread block of the tire that the blind hole has ∘ a first cross section (C1) at a first depth (de1) and ∘ a second cross section (C2) at a second depth (de2), wherein ∘ a first cross section (C1) at a first depth (de1) and ∘ a second cross section (C2) at a second depth (de2), - the second cross section (C2) is greater than the first cross section (C1) and the second depth (de2) is greater than the first depth (de1) and - the material of the tread block has a Shore hardness of from 50 ShA to 80 ShA, according to ASTM standard D2240, version 15e1, at a temperature of 23 °C, the method comprising - using such a drill bit that comprises a shaft extending in a longitudinal direction of the drill bit , wherein ∘ the drill bit further comprises a protrusion , such as a flange , radially extending from the shaft , and the method comprises forming the second cross section (C2) of the blind hole by using the protrusion of the drill bit , and/or ∘ a part of the shaft is configured to radially expand in use, the method comprising forming the second cross section (C2) of the blind hole by using the radially expanding part of the shaft , and/or ∘ the method comprises forming the second cross section (C2) of the blind hole by arranging a longitudinal direction of the shaft at various angles relative to a normal (N1) of the tread . ∘ the drill bit further comprises a protrusion , such as a flange , radially extending from the shaft , and the method comprises forming the second cross section (C2) of the blind hole by using the protrusion of the drill bit , and/or ∘ a part of the shaft is configured to radially expand in use, the method comprising forming the second cross section (C2) of the blind hole by using the radially expanding part of the shaft , and/or ∘ the method comprises forming the second cross section (C2) of the blind hole by arranging a longitudinal direction of the shaft at various angles relative to a normal (N1) of the tread . <EOS>