Unusual armourer tools and Lee Metford/Long Lee/Martini Enfield foresight covers

I picke dup a few things today but I'm struggling to identify some of them - all input would be gratefully received.
In no particular order:
1. A Salter spring weight weigher which is similar to those used with the Lewis MG but this is made of steel and the T-Shaped addition looks as though it would fit on the end of a wooden rod. It is Broad Arrow marked.
2. A brass implement with a scribe attached on a chain. You can see the Broad Arrow marking and Crown above INO above 303.
3. A bore inspection mirror for something like .50 Cal but unlike others I have seen, especially with the two rivets and a screw at the rear.
4. A couple of Protectors, Sight which could be used on Lee Metford, Long Lees and Martini Enfields. One is Broad Arrow marked and has the Serial No. 611

Not sure of the rest but the string steel sight protectors are for all models of long lee, except the CLLE variants with pattern 14 style front sight wings.

What's inside the brass and steel unit? Looks like it might have been modified however.

The brass and steel unit (square steel section then brass round section) is a bore viewer with an angled mirror inside.

Quote:

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Originally Posted by Nigel

The brass and steel unit (square steel section then brass round section) is a bore viewer with an angled mirror inside.

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What's the OD of the round portion?

It's a fraction under the rim size of a .50 Cal cartridge.

Then I wonder if some or all of those could be tools for the Vickers .50 water-cooled MG?

The bullet-shaped point might have been to aid in lining up holes between say a gun and its mounting?

Here's a WAG for the the T shaped tool with the bullet shaped end. Could it be for removing the end plate of the Boys ATR recoil reducer during cleaning? The MkI Boys had the round two piece recoil reducer that used flat head screws to hold the end plate on. After cleaning the tool's bullet shaped end looks like it could have been inserted into the bore to ensure proper alignment. Armourer's tools often had all that was needed to complete a task so this makes sense. What is the OD of the bullet shaped end?

Just found these photos on an old HD while looking for the No.4 jump case photos, so clearly not a .50 Vickers bore viewer unless a locally made expedient.