Ok finally got time to tackle this, after several tries I had to remove wheel, bevel box and still remove the shock bolt!!! I then needed to adapt the gun fitting ('Moscow bend') however when I removed the bevel the alignment marks on the shaft were on the same half!!!!! there were 2 notches in the end ,one bigger than the other, is there a way to check that I have assembled it correctly(I know guzzichrondria)