1. Centralized vaj huam sib luag ua haujlwm, kev tswj xyuas kev sib txuas. Txhua qhov chaw ntawm lub tshuab yog tsom rau ntawm lub vaj huam sib luag ua haujlwm tswj.
2. Lub luag haujlwm tseem ceeb ntawm lub vaj huam sib luag:
A. Spindle ceev hloov
B. Rewinding qhov ntev
C. Unwinding nro hloov kho
D. Rewinding nro qhov chaw
E. Pib thiab nres khawm.
3. Cov riam txiav tau txais cov riam sab sauv thiab sab qis. Thiab qis dua riam shim tuaj yeem hloov tau raws li qhov sib txawv txiav dav, thiab txiav qhov dav tuaj yeem hloov kho kom ua tiav cov kev txiav zoo.
