The HR100S should be one of the best arms ever made, if not as "blingy" as the beautifully presented japanese arms. It'll certainly lack the 500 - 700Hz resonances that ALL arms with detachable shells seem to exhibit...
The 100S's I had anything to do with never seemed "wobbly" to me, so yours may have been abused. Audio Origami should be experienced enough to carefully reset the bearings, assuming they haven't been damaged (they're ceramic I understand)..
I've just been presented with a rather good looking arm from a defunct Kenwood KD750 (many thanks again Paul). It needs a full re-wire but apart from that looks fully intact. I look forward to getting it done when I can afford it.
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me