Learmoia,
I owe you one thanks to your 'stereo test video' & my L and R ear bud quest you nailed ! Thanks....
So, you've a cast on your wrist (fractured my L arm as a child in '50s !) and want to create ON the cast. Yes ?
If you can draw and paint, what about a full side view of an 0-4-2T HO switcher in color using enamel (so as not to bleed later from sink use, bathing, coffee...May have to sand down the plaster for smoothness..Black engine on white plaster. Then run 9v battery to headlight and/or bulb in firebox ash pan...
Funny, why do I feel like I've written a belated April fools gag when there's no such thing ?!!
M