There is another purpose for these input shafts. Grind a nice Pointed Cone on the front where the Threads are. Cut off the Gear with an Abrasive Blade. Find a Dana 44 Front Axle with the inch thick Tubes. Have it bored to be just a little bigger that the largest O.D. of this Projectile. Add 1 pound of smokeless powder and this would go thru a tank!
