Thanks Frenchy, I will bookmark and peruse the Elephant site there look to be lots of useful tools there.

Max's command only creates hex headed bolts, and I need cap head and countersunk bolts. Barry M (http://moi3d.com/forum/index.php?webtag=MOI&msg=5451.74) has NOD files that do what I want. Hence the need for the node editor. Now I just have to get it working.

Edit - Thanks to all - now working fine.

I keep this Nut and Bolt NE of Barry's bookmarked:

http://moi3d.com/forum/index.php?webtag=MOI&msg=9949.1

Yes, very useful.

What I wanted to model was a long, LH thread leadscrew. I made a long (300mm) Cap Head screw. Cut the head off and mirrored the resulting threaded rod. Although its a set of joined surfaces rather than a solid it meets my immediate needs.

Thanks again Barry.