said elastic means is also possible to realize protrusions 32 towards the outside which matching with appropriate niches on the diameter of the circular groove 31 on the inner diameter 19 of the well 18 of the basket 6 are constraining angularly said elastic means and prevent it from rotating inside said circular groove 31 b be constituted by an annular elastic means 40 in its most simple embodiment it is an o ring housed in a circular groove 41 formed in the post of the basket fig4 which is deformed while mounting the bobbin case 8 by the inner diameter of the hole 24 of the shaft 25 of said bobbin case 8 c be constituted by two or more annular elastic means 50 in the simplest realization they are o rings housed in respective circular grooves 52 formed in the post 23 of the basket 6 fig5 which are deformed while mounting the bobbin case 8 by the inner diameter of the hole 24 of the shaft 25 of said bobbin case 8 d be constituted by one or more means 60 61 of material that is elastic to compression and fixed for example stuck or glued or affixed as coating on the inner diameter 19 of the well 18 of the basket 6 which are deformed while mounting the bobbin case 8 by the outer diameter 20 of said bobbin case in fig6 are represented by way of example but not limiting respectively two cylindrical means 60 embedded in respective seats formed on the inner diameter 19 of.