Percussion Lock Terminology

B. E. Spencer

Percussion Lock, External View

A- Mainspring retainer stud
B- Lockplate
C- Hammer nose recess
D- Hammer head
E- Hammer spur
F- Hammer
G- Tumbler screw
H- Sear spring screw tip

Percussion Lock, Internal View

A- Upper limb of mainspring
B- Lower limb of mainspring
C- Claw of mainspring
D- Lower pivot stud of stirrup
E- Stirrup
F- Upper pivot stud of stirrup
G- Tumbler axle/pivot
H- Tumbler
I- Pawl of sear (sear nose)
J- Sear pivot screw
K- Body of the sear
L- Arm of the sear
M- Sear spring
N- Sear spring screw
O- Bridle
P- Bridle screws
Q- Hammer
R- Hammer spur
S- Hammer head
T- Stirrup arm of tumbler
U- Bolster
V- Lockplate

Percussion Lock, Internal View, Bridle Removed

A- Upper limb of mainspring
B- Lower limb of mainspring
C- Stirrup
D- Claw of mainspring
E- Lower pivot stud of stirrup
F- Tumbler
G- Tumbler axle/pivot
H- Fly
I- Half-cock notch of tumbler
J- Pawl of sear (sear nose)
K- Sear pivot screw
L- Body of the sear
M- Arm of sear
N- Sear spring
O- Sear spring screw
P- Bridle screw holes
Q- Hammer
R- Stirrup arm of tumbler
S- Upper pivot stud of stirrup
T- Bolster
U- Retainer stud of mainspring

Copyright © 1997 B. E. Spencer


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