The one on the left is the original unit... reasonably shiny but overheat-damaged where the black meets the base.
The replacement unit in the middle is a lucky $3 find at the Red Deer AB swap meet on Friday... identical but kind of scuffed and dull.
The treasure at right is a freebie throw-in with the middle unit and intended for practice polishing.
Looking for suggestions on how to polish the black plastic knob on the replacement unit to roughly equal the appearance of the original. Thanks in advance!
When I've wanted to polish parts, I've used the jeweler's rouge compound and a flannel buffing wheel, mounted to an extended shaft electric motor. Got wheels & five different compounds at Harbor Freight... Note: DO get different wheels for using the different polishing compounds; DON'T mix different compounds on the same wheel. Educate yourself, protect yourself, then try some practice with your practice sample. Good luck!
Take Care; Behave; Keep Breathing (and)
"T-reat yourself to some 'Sweet-T'!!!"
They also make an abrasive buffing compound specifically for plastic which works well. I think mine came from a set of buffing compounds bought at one of the large chain home improvement stores.
By accident I discovered that the disinfecting wipes (the ones in the circular plastic containers) clean plastic up very well. I have the "Member's Mark" brand that are alcohol free. I was wiping my hands and saw over spray on a plastic knob and wiped it down and it cleaned it up very well. I started using them on many plastic items and was surprised how well they clean and shine.
Done! I wasn't looking for perfection (nor did I find it) but did achieve the "lightly used" look I wanted.
Thanks to all for your suggestions and comments.