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),