@ai6yr
For painting, a box, tent or makeshift enclosure keeps the over-spray from getting everywhere. Keeps the bugs, dust and twigs off the paint until dry.
Do you have any stray wallboard?
I think you need a bigger box.
@ai6yr
You can get a nice ombré with spray paint. Just pick two colors that go well together. They usually blend well when they are next to each other on a color wheel.
I could see you riding a blend of high visibility yellow and orange.
https://mikylacreates.com/how-to-paint-an-ombre-bike-a-bicycle-makeover-before-after/
You/the replies seem to have covered threaded - non threaded are standardised to the extent that you "just" need to specify
1st type:internal semi external
2nd internal diameter top IE top of steerer tube
3rd external diameter top
4th int diam bottom IE bottom of steerer tube
5th ext diam bottom
6th straight or angled contact
Poss 7th angle of contact points
Poss 8th colour of cap cover if ext
To make it easier steerer tube is most often quoted in inches the rest in mm
:-)