Creative Engineering ROCK-A-FIRE EXPLOSION - Page 88

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The

Chest

F.

The

problems

in

the

Guitar

Rock

and

Hand

Slide

movements

are

mostly

caused

by

improperly

adjusted

critical

angles

or

the

fiberglass

body

is

mounted

too

far

forward

allowing

it

to

interfere

with

the

movements.

The

Guitar

Rock

movement

is

covered

first

in

the

text.

(See

Drawing

Page

3-057)

1.

The

rear

mount

of

the

Guitar

Rock

Cylinder

is

attached

to

a

aluminum

block

{A)

welded

to

the

chest,

using

a

1/2"

Dowel

Pin

{B)

•

The

Dowel

Pin

is

held

in

the

block

using

1/4"-20

x

1/2"

set

screws.

If

the

set

screws

are

allowed

to

loosen

in

the

block

(A)

or

the

bushing

in

the

cylinder

is

worn,

the

1/2"

hole

in

the

block

could

become

elongated,

if

this

happens

replacement

of

the

welded

chest

frame

is

required.

So

keep

a

close

watch

on

these

set

screws

during

P.M.

of

the

show.

If

the

set

screw

hole

becomes

oversized

or

the

threads

are

striped,

drill

out

and

tap

the

hole

to

the

next

larger

set

screw

size.

{5/16"-18)

To

replace

the

rear

mount

bushing

in

the

cylinder,

or

to

rebuild

a

damaged

cylinder

refer

to

Pages

3-009

thru

3-011,

and

all

drawings

referred

to

by

that

text.

2.

The

front

mount

of

the

Guitar

Rock

Cylinder

is

attached

to

the

Actuation

Lever

{C)

using

a

3/8"

Fas-Pin.

The

Actuation

Lever

(C)

is

welded

to

a

double

shaft

collar.

The

shaft

collar

is

attached

to

the

twist

shaft

{D)

using

set

screws

and

the

shaft

collar

is

drilled

and

pinned,

to

the

twist

shaft,

using

a

3/16"

Roll

Pin.

If

the

Roll

Pin

breaks

it

is

probably

due

to

the

set

screws

being

loose,

watch

them

closely

during

P.M.

To

repair

a

broken

Roll

Pin:

a.

Loosen

the

set

screws

in

the

double

shaft

collar.

Pull

the

Fas-Pin

cylinder

front

mount,

align

the

holes

through

the

collar

and

the

twist

shaft

{D).

b.

Tap

out

the

broken

Roll

Pin

using

a

small

pin

and

hammer.

c.

Attempt

to

tap

in

a

new

Roll

Pin

the

same

size

as

the

broken

one.

If

the

hole

is

over

size

and

the

pin

fits

in

sloppy,

you

will

need

to

re-drill

the

hole

for

the

next

size

larger

Roll

Pin.

Align

the

holes

and

re-drill

the

hole

1/64"

below

the

size

of

the

Roll

Pin

you

want

to

use.

Note:

If

the

hole

must

be

enlarged

bigger

than

1/4",

it

is

suggested

to

replace

the

Actuation

Lever

{C)

and

the

twist

shaft

{D)

•

3.

If

the

bushing

pressed

into

the

Actuation

Lever

{C),

is

over

size

and

must

be

replaced:

a.

Removal

of

the

actuation

lever

is

not

required.

Tap

out

the

old

bushing

using

a

7/16"

pin

and

hammer.

b.

The

bushing

used

in

the

Guitar

Rock

Actuation

Lever

is

a

3/8"I.D.

x

1/2"0.D.

x

1/2"

long

bushing.

{Part

#28-032-020)

Tap

in

the

new

bushing

using

a

hammer.

Place

a

piece

of

wood

on

top

of

the

bushing,

so

that

you

don't

damage

it

when

taping

it

in.

If

you

cannot

get

a

good

press,

try

marring

the

hole

with

a

Awl,

if

this

does

not

work

replace

the

part.

3-Q51