I intalled the quiver bushings on my old Bear Grizzly on purpose. My uncle already had some holes drilled in it from a failed sight bracket attempt Lord only knows how long ago? So I didn't figure a couple more holes in the riser area would hurt the value anyway.
I'm not real keen on strap on quivers and I don't like carrying anything on my back or my hip. I have honestly never found anything that was quite enough or didn't hinder me while moving around through the woods.
I do like my quiver attached to my bow and I like it easily removable for when I'm in a tree stand, so the answer was obvious for me. I bought the bushings from Rockler and they were stainless steel.....not brass. Don't use brass!
Here's a pic of my Grizzly wearing the quiver.