The use of the V-1 buzz bomb never came anywhere near to tipping the war back towards the Germans. They were more of a terror weapon to try to get the British public to criticize their leaders over conduct of the war. Fast fighter aircraft were able to destroy them in flight by getting their wing tip under the wing tip of the V-1 and then bank their own aircraft tipping the V-1s wing. The gyro system inside the V-1 was not able to compensate for this and the buzz bomb went down short of its target. Many V-1s crash landed relatively intact in England and there was no need to go to Sweden to retrieve parts off of one. What really stopped the buzz bomb threat was the Allied ground forces overrunning the areas in Occupied Europe from where they were launched.