TD,
Sounds reasonable to me, and leaving it "loose" did work as intended - My garden only had 1 HUGE rock in it (still need to figure out how to get it out, right now, I know right where it is and just float over it), but, my neighbor across the street asked me to till a patch for him. Good grief, I as soon try to till the road! Inches of dry GA red clay and several basketball sized and larger rocks were found. I have to assume that with no broken tines so far, (knock on wood) that the theory holds. Maybe I would have detected the rocks and been able to lift away, but, becasue the tiller had some room to move side to side, I think helped. Now, let me say, total, I've probably only tilled a whole acre (my 100X100 garden a couple of times, and a couple of patches for neighbors) so, I ain't no authority, but, I am workin on it!
However, I can see where you could break or bend pins and such as Dave mentioned above... so I think I'll do as my father (rip) might have said: Humor it a little in both directions - tighten down a little more, but not as much as for other implements.
BTW, I turned that pile of clay into baby powder, and it sat about 4 inches above the rest of the yard, man, I (and they!!) love that thing! I'm headed down to deer camp this weekend to put in some late season plantings, can't wait! The only thing is I haven't hooked into the FC Box blade yet, so we'll have to drive through the ruts until it comes in!
Dob