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Page 49
FIG. 8.01
CHAPTER EIGHT
SECTION 8.0
MAST PLATE AND DOUBLE TRUSS
MOUNTING THE MAST PLATE TO THE BOOM
When you have finished mounting and leveling each of the EHU’s, use clamps or cord to secure the boom in
place onto the sawhorses or whatever structure you are using to support the boom. Double check the level
readings of the EHU mounting plates before securing. By doing this, you are “locking” the boom into a level
position, which will make the leveling of the mast plate much easier.
The DB42 uses two identical mast plates, mounted together as shown in
figure 8.01
. The reason we do this,
is because it is much easier to form two aluminum plates that are 0.25” thick than a single plate that is 0.50”
thick. There is no compromise in strength by doing so.
The DB42 employs a special system, called the EZ-Eye, for both mounting and leveling the boom. The EZ-
Eye is also used in preventing the boom from shifting during high winds.
Figure 8.01
Shows an exploded drawing of the boom and mast plate assembly, along with the EZ-Eye sys-
tem. This parts explosion is a useful referral tool as you complete the steps in this section.
Key QTY
Part #
Description
A
1
60-0142
7/16” x 4” Threaded EZ Eye bolt
B
3
60-0143
7/16” Nylock nut
C
2
60-0144
7/16” Galvanized washer
D
1
60-0145
3/8” Stainless steel eyebolt
E
4
60-0141
5/16” x 5” Hex head bolt
F
4
60-0046
5/16” Nylock nut
G
1
60-0050
3/8” Nylock nut
H
4
10-1601-61
3” Aluminum saddle half
J
2
10-1610-22
11-1/2” Aluminum mast plate
RE
FLE
CT
OR
DIR
ECT
OR
3
3”
BO
OM
SECTION
A
B
C
C
D
B
E
E
E
E
F
F
F
F
G
H
H
H
H
J
J
B