I checked all the manuals Badger linked above plus the 1931 Instructions for Armourers last night and nothing is said other to check the cleaning/lubrication manual which we don’t have in our library.
The only thing noted in the manuals was the fact that the Armourer was to completely strip and dissemble the bolt once per year during inspection and clean and oil the bolt with GP oil.
I go further than bradtx when cleaning corrosive ammo and remove and clean the bolt head because I’m five time more excessive compulsive than bradtx.
That being said you won’t go blind if you play with your bolt head BUT as Villiers stated the individual Britishsoldier was NOT allowed to play with his bolt head and the British soldiers were forced to go to Bordellos to have their bolts completely cleaned.
Just remember, removing the bolt head is so easy even a Marine can do it.
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