G'day Martin,
Just happened to turn my computer on over lunch.

I've found these guys to be really good. I've had to source long bolts for deep tuttle boxes etc.

Some of the SS bolts have the Allen Key hex head which is the same size as the batten tensioning tool, which is handy.

Braeside....

www.cylex-australia.com/company/melbourne-bolt-co-pty-ltd-15113066.html

There's another one in Dandenong on Frankston-Dandy rd if you need it.

All the best
-Bondy

If you ever get stuck, and need a long 6mm bolt in a hurry, you can get away with buying a 6mm coach-bolt from bunnings and cutting a slot in it. Not SS, and needs you to cut a slot and use a metal washer, but might get you out of a jam if you need something urgently.