Thanks for the info Paul, I was going to get a set from RS but now i will hold off and order the correct set. I know from experience as a pistol smith that the right screw driver makes all the difference in the world. I'm also glad to hear that you are not a GP.
By the way, do you know who is responsible for the JIP?
The 4 screws we are talking about are nothing special, a cheap set of jewellers screwdrivers is more than sufficient.