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I've tried to remove the firing pin from a 1906 BSA No 1 Mk I, but can't budge it. I can't seem to get a good enough grip on it to turn it. While shining a light down the bolt body, I observed only one notch in the bearing portion of the pin! Mk IIIs,and later models, as everyone knows, have two. Am I seeing things? If my observation is correct, a regular firing pin removal tool probably won't work. Google is of no use. I just wants to refer me to info on Mk IIIs, no matter how I search.
It should actually be one raised lug on the striker. If you look at your bolt head it should have a notch in it as well. If you turn the cocking piece so the striker is full forward that notch in the bolt head will fit on the lug on the striker and allow for turning it out. So long as it will break loose from the cocking piece anyway. Early Mk III's were like this as well.
Yes, the early Sht L-E's were made like this, and of course the bolt-heads had to be made with the cut-out even later so as to interchange with the early striker.
By some time in WW2, with the quantity of early strikers still in the system now low, bolt-heads were made without it.
It wont fully unscrew first time, you need "two bites of the cherry" to do it.
For clarification, here is an example of later and earlier bolt heads with the early one having the notch in the threaded portion.
Attachment 97551