Adapter back plate is used for indirect fixing of the lathe chuck. It is used when a lathe chuck can not be attached directly to the spindle. Adapter back plates are tightened to the back of the lathe chucks by screws. Spindle adapter can also be attached with screws or the CAMLOCK system. When assembling, make sure that the surfaces of the spindle-head assembly - adapter - lathe chuck are thoroughly cleaned. For cleaning a surface, the WD-40 multifunctional product will perform well.
Scroll plate in the lathe chucks is used to evenly clamp the jaws. From the bottom sroll plate has teeth, together with the toothed wheel (so-called nut), it forms a gearwheel. By turning a wrench placed in the gearwheel, we introduce scroll plate into motion.