5
Top View - Fittings Mounted to Side of Boom
Sheave Side of Block is Towards Cleat
Installing Cheek Block
Hold cheek block on the side of the boom so aft end of block is even with forward
mark. Use cheek block as a template to mark holes and use center punch to start
holes. Use screw method. Use
5
/
8
" (16 mm) long trusshead or self-tapping screws.
Do not drill rivet holes.
DRILL HOLES: Machine Screws
1
/
8
" (3.2 mm) and #8-32 Tap;
Self-Tapping Screws
9
/
64
" (3.5 mm).
Note:
Position cheek block so sheave side of block is towards cleat. Refer to the two
diagrams on page 6. In most cases cleat will be mounted forward of cheek block near
forward end of boom. If there is other hardware in the way mount cleat aft of block.
Screw block to boom.
Mounting Adjusting Cleat
Mount cleat near forward end of boom so Lazy Jacks may be easily adjusted. Before
mounting cleat, swing boom out as far forward as it will go to make sure cleat does
not hit mast. If you have a single line reefing or other obstruction forward of block,
mount cleat aft of block as pictured on page 6. Use cleat as a template to mark holes
and use center punch.
Do not drill holes for rivets!
Drill size for screws -
9
/
64
" (3.5 mm) Use supplied flat head self-tapping sheet
metal screws.
Note: If you have internal boom control lines, cut off the ends of the self tapping
screws and round off tip to avoid snagging internal lines.
First
drive screws into
boom to cut threads.
Installing Dead End Eyestrap
Use the eyestrap as a template to mark holes and start holes using a center punch.
DRILL HOLES: Screws
5
/
32
" (4 mm) and
Tap
#10-32
Rivets
13
/
64
" (5 mm)
Important: Put eyestrap through line eye splice before fastening to mast. Use
3
/
8
" (10 mm) long screws or rivet eyestrap and line to boom.
Measurement from Chart B