You could also mount the spacer before installing the drive flanges or remove the nuts and washers that retain the drive flanges then install the spacer.
I'm not following this at all. The drive flange won't fit through the hole in the spacer (which is gonna complicate things no matter what if Rookie uses the spacers and needs to do any work to the knuckle) and the flanges kind of need the nuts and washers.
Really, the best option is to get lug-centric spacers. If you're concerned about centering the wheels, install them with three acorn-style lug nuts just snugged, which will center the wheel, then install 3 shank-style lug nuts (if that's what you're using on your wheels), remove the acorns, and replace with the last three shank-style. If your wheels use acorn-style, just snug them all gradually, allowing the wheel to center on the lugs (as almost all wheels used to do before the fancy hub-centric wheels came out).
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