You buy a thousand dollar or more engine in the case of the Niagara and although greatly detailed from the Post-War cast steam engine models with many applied parts , you still see the screw heads holding on the wheels. WHY is this detail so hard to escape.
In another thread
Pete ("Norton") made some significant modifications to the Lionel Vision Niagara. One of those changes included modifying the screw head that holds the wheels to look more like bearing retainers that are on the actual Niagara (and other engines).
Pete meticulously filed and drilled a screw to simulated the wheel bearing. See the thread pictures. It is difficult to make these as each one is hand-made.
So in concert with Pete I designed a wheel COVER to fit over the screw that I am printing now. It looks like this.
Note the bottom Right side view that is GHOSTED to show the inner recesses around the star-shaped bolts and the recess at the bottom. The inner diameter of the underside recess is 0.237 inches.
IF THIS PRINT WORKS, and the application also works email me how many you want. Since I will be printing these a about 120 a crack I should have enough.
Now you will still need to paint them from the gray color of the resin and attach them.