This is your thread from December 2011 regarding the leak in the gun:-
http://p8ntballer-forums.com/threads/small-air-leak-from-breach-on-creed.106598/
It seems odd that, after fixing the leak last December, you went to the trouble of buying 5 o-ring rebuild kits and did not bother to fix the new leak in the 6 months between then and now.
If you had repaired it - as it is an easy fix - you could have kept it or sold it at a higher price. The fact that you sold the gun for one third less (£60) than your asking price indicates that you were eager to be rid of it.
I am aware that the allen keys are supplied with the gun, and have stated as much in my previous post. I know this because I already have a Creed and have the allen keys supplied with it.
My point is that none of the keys would turn the screw as the head was stripped.
I have taken Foot's advice and used a hammer & chisel to gently cut a small groove into the head of the screw, so that I could get it out with a screwdriver. I have replaced and lubed the o-ring, and the leak is now fixed.
I have asked Foot if he can sell me a replacement screw and valve plug, as I do not have any in the spares kits I have.
In relation to your allegation that I caused the problem myself, I suggest that you look at my history of buying and selling guns. I am not in the habit of lying about things that I buy.
Also, I have been an Eclipse Tech for some years and am not in the habit of damaging guns.