Spacers are used to adapt each front-end assembly to handle the longer sizes. Individual designs of the front-end assemblies may differ, however they all use the same principle. The assembly is comprised of prewinder, spacers, shims, cushion and mandrel. Three lengths of spacer are available, to handle 1 to 2 diameter inserts. It is important to select the correct spacer length.
Figure above shows correct assembly and disassembly of the front-end assembly.
After lubricating the mandrel threads, screw it into the prewinder so that it protrudes into the prewinder making sure the mandrel key locates into the drive sleeve keyway. Check that the plastic cushion is- at the base of the drive sleeve. Rotate the prewinder to line up for loading the insert and install the prewinder retainer nut. The prewinder retainer must be tightened by hand only. Over tensioning will prevent free movement of the mandrel, leading to possible damage.