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+1.
Looks better because the trim ring is recessed in, as opposed to being just stuck on and you don't have to worry about ruining the trim ring when removing it.
A lot of Dyna riders have done that after member WS6 Formula started it a few years ago. The one in my sig pic is mounted on a plain round cover, or it can be run open. (Edit: Mudpuddle did these for a bunch of guys a couple of years back, but he no longer does them for others)
Here's a couple of threads (the second one with video):
since I don't have a die grinder, I used a Dremel tool @ 30,000RPM with a reinforced cutting blade, which ran through the aluminum of the cover like butter.. and since I don't have an angle grinder, or a drill press (though my neighbor does but he was at work).. i filed down the edges and evened it all out by hand.. it actually was pretty easy and took maybe 2 hours total.. since i was doing it all by hand and all.. then shot the edges up with some close-as-can-be color matching engine enamel to prevent rust.. i thought she turned out quite good actually..
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