Roof basket nuts, nyloc or black plastic type.

Dean, I have the EXACT same set up as you.

Problem.......... the nuts & studs face upwards, and ruin things in the rack.

I too was perplexed, but ended up fabricating 4 new brackets which face downwards, and using Nylocs. The basket stays on permantly.

If you wish to remove often, then Nylocs are NOT the go. Try using 2 standard nuts together as lock nuts instead.

Wolfie

do as Wolfie suggested but instead of using two nuts locked together or nylocs put a blob of silicone on the threads after tightening, stops things coming undone but easy to undo with a spanner.

I originally didn't trust the black plastic knobs and used nylocs but it was a hassle with taking the basket on and off, so went back to the knob's and have never had a problem with them coming loose, plent of offroad stuff to. Mate took a basket accross the Simpson with same knobs never had a problem with them getting loose but he did snap a Rola sports bar in half.
Give them a try and see how you go, you'll probably have no problems, I always check them at every stop anyway but never had a loose one

Try putting a flat washer along with a locking washer when using the "plastic" knobs. Nylocs are a pain if they need to be undone regularly. They do have their use though like on battery trays etc.

cheers

I had the same problem, tried nylox, gone back to plastic knobs no problems, even with hard yaka, look at my rig photo's!

If I was going away for a week or so I would do as Peter suggested and just whack a blob of silicone over them.

Just to be safe and not sorry I would check them every day anyway, I do. One time one of the eight black knobs was a little loose.