1. Covtxoj hmabYuav tsum yog tus du thiab tiaj tus, thiab tsis muaj qhov tsis xws luag xws li cov kab nrib pleb, ntse nce, kis las loj, thiab lwm yam. 2. Nws yog nruj me ntsis txwv tsis pub siv cov hlau cam lossis cam khwb cia hlau Shackles. Lub cev qov tuaj yeem raug forged nrog tua cov hlau, thiab tus lej PIN tau txais machined tom qab forging los ntawm bar. 3. Tustxoj hmabyuav tsum tsis txhob drilled los yog welded los kho. Tom qab lub buckle lub cev thiab tus pin ncej yog mus tas li deformed, tsis muaj kev kho yuav raug tso cai. 4. Thaum siv, xyuas lub buckle lub cev thiab lub ntsia liaj qhov rooj, thiab tsis txhob hnav hnyav, deformation thiab qaug zog tawg. 5. Thaum siv, kab rov tav yuav tsum tsis txhob muaj kev ntxhov siab, thiab tus lej ncej yuav tsum tau muab tso nrog tus lej PIN kev nyab xeeb. 6. Tom qab tus PIN ob sab yog sib dhos kom raug, qhov dav ntawm lub cev muaj sia yuav tsum tsis txhob txo qis, thiab kev sib txuas xov yog qhov zoo.
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