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.