The grenade has a tin screw cap on the bottom....you remove that and there is a china ball on a string....when you pull this it starts the igniter.
It's interesting to note too....that German grenades kill by blast effect...rather than fragmentation like the Allied grenades....with the Germans later making an optional splinter sleeve that goes over the head to add the splinter effect.
I have a real one sitting here on my desk!
Cheers, Truppe.
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