Harken 1080 MKIII Jib Reefing & Furling - Manual (Page 45)

Assembly
April 2000 Unit 3.25 MKIII 23
In this step, the drum is attached and the unit is readied for
installation on the boat
7
Thread the locking collar onto the drum assembly
as far as it will go.
Thread the drum assembly onto the stay until the
colored mark on the threads does not show.
The coloring on the threads warns of insufficient
thread engagement. It is provided only for your con-
venience and may wear off. The only positive means
to insure proper thread engagement is to measure
the exposed threads. At no time should more than
3 1 /
2
" (89 mm) of thread be exposed at either the
top or the bottom of the turnbuckle.