I just did something to my 1/72 scale Gato sub today.
The periscopes on the sub was very bad. They had some bows on both periscopes. What I did was, I bought me some 3/32X.014 aluminum rods on them and it turned out perfect. Now the periscopes are very straight.
So I just wanted everyone to know.. I do not know if anyone has done it or not done it, but just founded out today...
HTH..