This version was recorded in 1981 as part of the beneficiary Amnesty International 'Secret Policeman's Other Ball'
Copyright should be public domain yet it is impossible to figure out as at the time nobody considered the need of the internet in 2019 for backwards BS copyright notice.
As this song is touching on the very situation that Julian Assange is in and it was recorded as beneficiary for Amnesty International AND is probably past it's copyright expire date anyway if there even is a copyright on this version. And then again it promotes the music / creates a new demand for people to actually buy it.
So lets use common sense. The song was recorded as beneficiary for Amnesty International after all.
A quick and easy way to make minute holes in the silver shaft on a sting hook, there may be other ways but this is my own way of doing it. If you find that the hole is slightly larger than intended, you can close down the hole again by gently hammering across the hole itself, this will peen over the inner edges as the metal spreads, thereafter you can fine tune the hole afterwards. A typical hole size is .20mm.