Correct way to mount leather sling on Enfield?

[Badger]

If you're referring to the leather sling found on No.4(T) sniper rifles, there's an entry in the England Section (click here) of the MKL (Milsurp Knowledge Library), showing how to install the 1907 on a No.4(T).

1952 Instructional Pamphlet for No.4 Mk1(T) sniper rifle

Regards,
Badger