I quoted the 2007 rule book... the accompanying diagram showed a closed nut (I run open nuts with long studs)...

I think there have been quite a few changes in the past couple years:

I seem to remember reading that you can't have a line-loc on the driven wheels period, but the only mention of it in the '07 book is under stock and superstock. General regulations and sportsman advanced ET etc say nothing about running multiple line locks... I inquired at the tech booth this weekend and they said no you can't run two line locs, and I said well I can't find it in the book so after 20 minutes of all the tech guys reading the rule book (the track was getting dried out after a heavy rain storm so we had some time to kill) they came back and said no you can't run two line locs (front and rear) and pointed to the passage that says: "if a differential pressure switch is used the front line loc should be after the switch" and I say that doesn't say I can't have a rear line loc... but I had to give up the argument as I could sense the tech guys were getting really irritated with me... and usually you want to be on good terms with those guys

-Chris