Product Description

The main components of the machine are: pitch selection scale,  indicator, polished shaft, eccentric socket, balance guide rail, dust cover, free-movement  level,  pressure adjusting nut, movable arm, fixed arm, reversal torsion spring,,  balance bearing, nail stop and revesal bearing.  There are four holes in the top of the Rolling  Ring Drive which are used to fix the accessories.
Maintenance:  The rolling ring drive is a precise apparatus which has been well-adjusted when it  leaves the factory.. Disassembly is not allowed.