hi all,picked up an avcoke air pistol sn12820 .its all there and not in bad nick but has inconsistant but poor power.the main cause of this is when the pistol is locked closed with the cocking lever it does not close enough to seal the breech properly.i i have stripped the gun and although sound i think the hooked closing link is worn..i am thinking i need to build up this link with weld at the hooked end.anyone else had this problem,if so any advice would be most welcome,cheers greasemonkey