LP2 Hole ?

[Graeme Stephens]

Just supplied a photo of my phantom MG gunner's foot rest mounts (to my post in March).
Had no replies to the mysterious engine cover bracket.
Now for the intriguing hole !
As per the photos my carrier has a 5/8" hole drilled through the front plate, maybe again only the Victorian carriers have them ! what for.
I could fall back on "a farmer in the 1960's drilled it" ~ maybe.
Or.