Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Very cool and very interesting. Congrats, Mike..!!!

I built a 55 with 4 screw cylinders and I believe they are bigger than what are on your newer engine. 

I also think this one has smaller screws than what Jensen uses on their 4 screw cylinders.

When you receive it, please measure the outside diameter and compare to your pre-war #25 cylinders and let us know. 

Whatever the origin, the modification work looks excellent!