just to clear things up, the action is only held in by one cap screw. There are anothe 2 cap screws which hold the hamster to the stock which on of the screws potruded futher out casiing it to put pressure on the action. I have added a photo to the original post which shows the mark.
Hope this make things a little clearer.
Slimmed down FTP900, Falcon T50..