Nzira yekubvisa tsvina kubva kumarara pazvipfeko?

Chikonzero chekuonekwa kwemafaro ekupfeka kunogona kushanda chero chinhu chesimbi: rivet, pini inokanganwa, nut, nail. Rust tsvina haisi nguva dzose yakashambidzwa panguva yekugeza. Tinopa nzira dzokuti tibvise nyore nyore dziya uye kubvisa tsvina pamapfeko: