Well, wasn't able to attack this with offset tools (didn't have available what I needed on location), but was able to get at the front nut...from underneath, instead of above. Then after attempting a few small tightenings of the adjustment nut, found it was bottomed out and could move no more. Result? Engine still doing the Hippy Hippy Shake.

Couldn't tell if rack damper bolt was the new or old one. Looked old, but saw a reflection of metal on the edge that could possibly have been gold-colored. Doesn't matter; time to order a new one from here on the Pelican and have a go at it again once received.