completely shrink the sleeve alternatively the fabric might be directly heated by infra red or high frequency radio wave radiation heating the mandrel directly by passing it directly through a magnetic induction field would also be possible resistance heating the entire mandrel directly by passing through it a large low voltage electric current would also be possible however the temperature of the mandrel affects the resin as it is applied to the sleeve and the mandrel may have to be cooled prior to the next step in any case some axial shrinking of three to four percent will occur whereas circumferential shrinkage of the dacron of up to 12 percent can be utilized to conform the sleeve to the mandrel and secure it thereto mandrel 12 is then supported between driving head 14 and arbor 15 of the winding machine at this point it may or may not be desirable to apply to sleeve 23 a preliminary coating of resin depending upon such factors as room temperature and the resin curing cycle the end of the prepared tape 30 is then secured as with band 31 to the end of the mandrel as shown at the left in fig4 tape 30 consists of a number of parallel roves 32 of glass filaments and the resin carried thereby the roves are drawn as from the creels 33 and over the comb 34 in the usual manner roves 32 may be dipped in a pan of resin before passing through the ring 35 disposed above the mandrel alternatively as shown roves 32 pass downwardly through the resin 36 carried in the cone 37 and through the ring 35 which comprises the lower end of the cone.