Stuff like this peaks my curiosity.
I have an 1890 Sparkbrook made Mk.I Lee Metford upgraded to Mk.I*.
The trigger guard, which is also Sparkbrook marked has a small hole in the right hand side adjacent to the magazine release. It looks clean and square and for all the world like it has been there since it left the factory.
[IMG]http://i65.tinypic.com/4gjcyh.jpg[/IMG]
I have other Mk.I rifles but no hole present.
At first I thought it might have been part of the manufacturing process, in similar fashion to the wee striker snapping hole in the left hand side of a Sht.LE Mk.III charger bridge. (If you haven't noticed this, go look, but don't insert the tip of your striker!). Nothing lies below the hole in the far side of the guard so I doubt it was part of a machining process.
Also doubtful that it is an oiler hole as the mag release and sear pivot are pretty much accessible to oil from the opening in the guard in front of the trigger.
It is a puzzler. It is quite evident even when the wood is on the rifle, so I am asking you if you have a Mk.I to go take a quick look see. It obviously was discontinued with later production, but for what was its purpose?