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Text copied from TM9-1985-2 German Explosive Ordnance 1953 :

Data:
Length: 2 3/8 inches w/det.
Diameter: 5/8 inch O.D.
Material: metal (glass shear pin)

Description:
It consists of a spring loaded striker bolt at the top of which is a grooved pressure head.
The bolt is held against the spring by a small glass rod, 0.05 inch in diameter, which passes through a hole in the bolt and by a safety device.
This safety device consists of a small pair of tongs, the turned-in end of which fit into another housing in the bolt and by the retained in position by the small spring cramp. In the base of this igniter is a percussion cap and the short No.8 detonator.
The igniter and detonator assembly are fitted to the H.E. by the thin metal cramp.

Operation:
In operation it is assumed that the safety tongs are removed by withdrawing the clamp.
Pressure or a blow on the pressure head will then shatter the glass rod and allow the spring to drive the striker on to the percussion cap.

Employment:
Designed to be used as a push igniter for improvised mines, etc., or as an impact igniter for H.E. charges when used in an assault.