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

Hi Rob,....in my "Flywheel Fix' update post, I'm sure after the  heated hub & chilled shaft temperature/dimensional normalized, the hardened set-screws "match seated" their own precise mating shaft dimples....No hint of hub--shaft slippage or need to re-torqre set screws yet after 1 1/2 yrs running.....

Yes that will work well. But the raised dimples can make the flywheels difficult to remove, as others have found out. The flat spots solve that problem.
The factory should also place the set screws around 90° apart instead of 180° apart. This will create a two point plus linear contact instalation, rather then just a 2 point.