I do not have a torque wrench... When I removed the rear wheel, I had my wife hold the rear brake lever and I was able to loosen the large (23-24mm?) axle nut with an 18" long 1/2" breaker bar.
Re-assembled tightening things up pretty snug and it rode great. After a few miles, I noticed a high frequency vibration in the seat at 50+ MPH. Still rides/corners great otherwise.
With bike on center stand, I hear a clicking when trying to pull the rear wheel from side to side, but I can't see anything moving. I can likely pull the axle cotter pin and tighten the axle nut a bit more w/o dis-assembling anything else, but I'm not sure if this is really the issue.