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I recall a post on this a while back. I'll asking for ideas on how to make a round number plate. What come to mind would be
make a round disk of brass or copper thick enough to be the plate. Drill and tap for a threaded stud. Then cut/saw the number for me it would be a 2 from thin brass or copper sheeting.
Next silver solder the number on which at the same time should solder the stud.

Another idea would be gluing a Vinyl number on the disk
and sand blasting.

Casting with plumbers silver solder or 95-5

Engraving, I know nothing about.

Etching I know nothing about. With a lathe I can make the disk
with a rim and treaded stud. the number is the problem.

Any thoughts?
 

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As long as you are using brass or copper, why not photo etch? I learned and used this method for the front plate on Lanakila. Its not real nearly as difficult as using a lathe.
After you create the first transparency, the rest takes very little time and you can do at least 4 at a time.
With a little more time, you can make a back transparency and locate the center hole for a screw or some sort of mechanical mount.
 

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Wow, that's a great idea! Now I know what I can do with the extra star plates I made for Lanakila!
 
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