G'day IanC,

The point about doornails being "clenched" raises a few memories with me ... I remember, in the '70s, making a wooden platform (for photographic work) and mounting it above the roof of my mini-van. My Dad, a woodworker, suggested that appropriate construction was like an outside (eg; shed) door ... and I remember being advised to "clench" the nails.

I also remember it weighing a fair proportion of the weight of a mini ... But it was cetainly strong and solid!

Regards,

Bob Bolton