Oscillator balance for a timepiece movement, comprising a felloe or rim , a plurality of systems (28 ; 128 ; 228 ; 328 ; 428 ; 528 ; 628 ; 728 ; 828 ; 928 ; 1028) for retaining adjustment inertia blocks (2 ; 202 ; 302 ; 402 ; 502 ; 602 ; 702 ; 802 ; 902 ; 1002) distributed along the felloe , as well as a first monobloc part (3 ; 103 ; 203 ; 303 ; 403 ; 503 ; 603 ; 703 ; 803 ; 903 ; 1003) defining a hub designed to be threaded onto a pivoting arbor, at least a first retaining system (28 ; 128 ; 228 ; 328 ; 428 ; 528 ; 628 ; 728 ; 828 ; 928 ; 1028) among the retaining systems comprising: - a guide wall hole (15 ; 415 ; 815) which forms at least a portion of a passage for an inertia block rod (20 ; 420 ; 820) and which is located in the felloe , - at least one relief pattern (35 ; 135 ; 235 ; 450 ; 635 ; 850) which at least partially borders the passage for the inertia block rod (20 ; 420 ; 820) and which is able to be in screwing relation with a thread (25 ; 425 ; 825) on the inertia block rod (20 ; 420 ; 820) when the inertia block rod (20 ; 420 ; 820) is inserted into the guide wall hole (15 ; 415 ; 815), - at least one portion forming a spring (11 ; 111 ; 211 ; 311 ; 411 ; 511 ; 611 ; 711 ; 811 ; 911 ; 1011) positioned in such a way that an elastic deformation of this portion forming a spring (11 ; 111 ; 211 ; 311 ; 411 ; 511 ; 611 ; 711 ; 811 ; 911 ; 1011) occurs when the inertia block rod (20 ; 420 ; 820) is screwed into the first retaining system (28 ; 128 ; 228 ; 328 ; 428 ; 528 ; 628 ; 728 ; 828 ; 928 ; 1028) and is accompanied by a tightening producing a braking to be overcome to change the degree to which the inertia block rod (20 ; 420 ; 820) is screwed into the first retaining system (28 ; 128 ; 228 ; 328 ; 428 ; 528 ; 628 ; 728 ; 828 ; 928 ; 1028), characterized in that a second part (4 ; 104 ; 204 ; 304 ; 404 ; 504 ; 604 ; 704 ; 804 ; 904 ; 1004) fixed to the first part (3 ; 103 ; 203 ; 303 ; 403 ; 503 ; 603 ; 703 ; 803 ; 903 ; 1003) defines the felloe , the first part (3 ; 103 ; 203 ; 303 ; 403 ; 503 ; 603 ; 703 ; 803 ; 903 ; 1003) defining the portion forming a spring (11 ; 111 ; 211 ; 311 ; 411 ; 511 ; 611 ; 711 ; 811 ; 911 ; 1011) of the first retaining system (28 ; 128 ; 228 ; 328 ; 428 ; 528 ; 628 ; 728 ; 828 ; 928 ; 1028). - a guide wall hole (15 ; 415 ; 815) which forms at least a portion of a passage for an inertia block rod (20 ; 420 ; 820) and which is located in the felloe , - at least one relief pattern (35 ; 135 ; 235 ; 450 ; 635 ; 850) which at least partially borders the passage for the inertia block rod (20 ; 420 ; 820) and which is able to be in screwing relation with a thread (25 ; 425 ; 825) on the inertia block rod (20 ; 420 ; 820) when the inertia block rod (20 ; 420 ; 820) is inserted into the guide wall hole (15 ; 415 ; 815), - at least one portion forming a spring (11 ; 111 ; 211 ; 311 ; 411 ; 511 ; 611 ; 711 ; 811 ; 911 ; 1011) positioned in such a way that an elastic deformation of this portion forming a spring (11 ; 111 ; 211 ; 311 ; 411 ; 511 ; 611 ; 711 ; 811 ; 911 ; 1011) occurs when the inertia block rod (20 ; 420 ; 820) is screwed into the first retaining system (28 ; 128 ; 228 ; 328 ; 428 ; 528 ; 628 ; 728 ; 828 ; 928 ; 1028) and is accompanied by a tightening producing a braking to be overcome to change the degree to which the inertia block rod (20 ; 420 ; 820) is screwed into the first retaining system (28 ; 128 ; 228 ; 328 ; 428 ; 528 ; 628 ; 728 ; 828 ; 928 ; 1028), <EOS>