Ko ta taatau kamupene rangahau motuhake me te whakawhanaketanga o te kōpae rauemi Abrasive tere me te pokapū parahi，e tika ana mo te whakakoi i nga whakapaipai koura, hiriwa me etahi atu konganuku ngawari.Kua wehea kia toru nga matotoru rereke, te reo me te pai, a ko te waenganui ko te poka whakauru tapawha o te pepa parahi, me whakamahi ki te Mandrel Koki Matau.Ko te mandrel he kowiri tira ， Hei taapiri mo te whakaurunga tapawha watea, ka taea hoki te whakaiti i te wiri o te huri kōpae.
I te wa e whakamahi ana, whakawiritia te wahi o raro o te wehenga kakau, ka whakaurua te wahi rawhi.I muri i te wa roa, ka taka te maramara ki waho, e tohu ana kaore i te nui te elasticity o te rawhi, me whakakapi te rawhi.