The grub screw at the zero position on the index turret holds a
spring loaded ball which clicks into a dimple on the top of the body, locating
The tool tip is brought to touch the start of the line
at the zero position and the stop set.
The turret is rotated to the 10 click and a long ten
line, about 0.05mm deep is cut.
The turret is rotated to the 1 click and four one
lines are cut.
the turret is rotated to the 5 click and a five line
is cut, then back to the 1 click for another four one lines.
There are holes in the turret at the three number positions, of a suitable
depth to suit the varying line lengths which the stop drops into.