thimble-skeinn. a skein for an axle made in tubular form.
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skein1862
thimble-skein1874
1874 E. H. KnightAmer. Mech. Dict. I. 144/2Arm..the axle-spindle. When of wood, it is strengthened by metallic straps called skeins, and sometimes by a conical sheath called a thimble-skein.