20mm
H
e
a
d
-s
h
e
ll
A
lig
n
m
e
n
t
G
u
id
e
fo
r W
e
ll
T
e
m
p
e
re
d
L
a
b
T
u
rn
ta
b
le
s
1.
C
a
rd
b
o
a
rd
2.
C
e
n
tre
o
f T
o
n
e
a
rm
tu
b
e
3.
19°
H
e
a
d
-sh
e
ll
a
n
g
le
1
5
0
mm
N
o
te
:
T
h
e
H
e
a
d
-sh
e
ll
is
fa
ct
o
ry
fixe
d
in
p
o
si
tio
n
. W
e
ll T
e
mp
e
re
d
L
a
b
u
n
e
q
u
ivo
ca
lly
re
ite
ra
te
th
a
t it
sh
o
u
ld
n
o
t b
e
mo
ve
d
.
H
e
a
vy
h
a
n
d
e
d
mo
u
n
tin
g
o
f t
h
e
ca
rt
ri
d
g
e
ma
y
re
su
lt
in
mo
vi
n
g
th
e
h
e
a
d
sh
e
ll.
In
w
h
ich
ca
se
p
la
ce
th
e
a
b
o
ve
g
u
id
e
w
ith
ce
n
tre
lin
e
p
a
ra
lle
l t
o
to
n
e
a
rm
tu
b
e
a
n
d
a
lig
n
h
e
a
d
sh
e
ll t
o
1
9
° a
n
g
le
.
It
w
ill
b
e
n
e
ce
ssa
ry
to
g
e
n
tly
b
u
t firml
y
re
tig
h
te
n
th
e
sma
ll
scre
w
fixi
n
g
th
e
h
e
a
d
-sh
e
ll t
o
th
e
to
n
e
a
rm.
D
o
n
o
t
o
v
e
r-ti
g
h
te
n
th
is
s
c
re
w
.
1
2
3
19°
9
