It is also possible now, to understand how some of Sheila Caffells DNA could have got into the inverted thread of the silencer, since, DI Cook (SOC), 29th August 1985, and PC Whiddon (prior to 20th September 1985) both screwed two different silencers directly onto the barrel of the rifle which had been resting and positioned against Sheila Caffells neck/throat at the scene as depicted in at least one of the crime scene photographs?
If you screw a silencer, or two, onto the barrel of the rifle, as did DI Cook, and PC Whiddon, after it was photographed in this position at the scene, there is going to be a very good chance that some of Sheila's DNA which must have got onto and into the external thread on on the end of the rifles barrel - when you screw any silencer directly onto this thread, some of Sheila's DNA which must have been on the rifles barrel, is bound to have become transferred into the inverted thread of both silencers by a process of contamination...
If some of Sheila's DNA got transferred into the inverted thread of the silencer by this process, it is also possible or likely that any blood (however small and seemingly insignificant) present on the external thread of the rifles barrel, could have been forced into the silencer, particularly on 29th August 1985, when DI Cook (SOC) dismantled the silencer, rebuilt it, and then he screwed the rebuilt silencer directly onto the external thread on the rifles barrel. What is apparent to me, is that at no stage was the external thread on the end of the rifles barrel examined for the presence of blood, prior to the alleged find of the flake by the ballistic expert, on 11th September 1985? Since, all we have been told is that the inside of the barrel was checked by use of a cloth pull-through, but no-one checked the external thread of the rifles barrel...
however...
when DI Cook dismantled the silencer on 29th August 1985,he separated (1) the end cap, (2) top washer, (3) first baffle, (4) second baffle, (5) third baffle, (6) fourth baffle, (7) Fifth Baffle, and there was a gap between these, and the remaining baffle plates of that silencer, and that stage there was no flake of blood present there, otherwise, COOK would have found the crucial flake of blood that was supposedly found inside the rebuilt silencer, once Cook (SOC) had submitted to the lab', on 30th August 1985. Since, there was no flake of blood, visibly present between any of the dismantled baffle plates, when Cook dismantled it, but we are being expected to believe that such a flake was present there, once the silencer was received at the lab' on and after 30th August 1985, and Fletcher dismantled the same silencer. Therefore, that flake must had been deposited inside that silencer, after Cook rebuilt it...