Lub zog ntawm cov hlau caij nplooj ntoo hlav hlau yog qhov lav tseem ceeb rau kev ua cov springs thiab kom ntseeg tau lawv cov kev pab cuam lub neej. Cov springs feem ntau ua haujlwm nyob rau hauv khoov thiab torsion kev nyuaj siab, tshwj xeeb tshaj yog nrawm springs. Nyob rau hauv qhov xwm txheej sib txawv ntawm kev siv, lub hauv ntej kawg yuav tsum tau ua los ntawm ntau yam Shackles Shackles, shackles yog ib feem uas qhov quab yuam yog qhov nyuaj thiab qhov kev nyuab siab yog qhov sib luag, thiab lawv kuj yog qhov tsis yooj yim. Yog tias qee qhov ntawm lub caij nplooj ntoo hlav raug puas ntsoog, nws yuav ua rau tag nrho cov cuab yeej tsum tsis ua haujlwm, tshwj xeeb yog qee lub zog muaj zog rau lub caij nplooj ntoo hlav, uas feem ntau siv los ua lub caij nplooj ntoo hlav sai thiab muaj zog, uas xav tau kom muaj qhov txwv qis dua thiab qaug zog txwv. Txhawm rau kom ua haujlwm tau zoo thiab ruaj khov ntawm cov cuab yeej.
Qhov ntsuas qhov tawv ntawm lub caij nplooj ntoo hlav hlau xaim yog ntsuas los ntawm tus lej rov ua dua thiab khoov duav. Hauv cov txheej txheem tsim khoom, khoov thiab torsion tau mus txog tus txheej txheem rau ob peb zaug, thiab cov hlau hlau tuaj yeem txiav txim siab raws li qhov tsim nyog yog tias tsis muaj qhov cuam tshuam qhov tawg ntawm cov hlau torsion.
