In the last document it states that if they need spare parts for the A5 scopes, they should return them to Winchester so WRA may install them. This is where it proves they were not Mann Niedner as the Army is in desperate need of the Clamping screws to mount the A5 scopes to the Marine bases. Clamping Screws are the name WRA used for thumb screws. The Mann Niedner conversion does not use Thumb screws as it mounts in a wedge design that tightens under recoil.
This is the better document asking for clamping screws. As they say it's ridiculous to ship an A5 scope back to WRA to have them only screw in a screw. They request they supply a shipment of replacement clamping screws (thumbscrews)
About two weeks after they request clamping screws, you see Winchester get a contact for 500 replacement clamping screws. This is from the WRA ledger.
If you have any doubt that clamping screw is a thumb screw. Here is the WRA document detailing that a clamping screw is their name for the thumbscrew to mount it to the dovetail base.
