On Fri, 25 May 2007 00:14:06 +0800, OldNick
wrote:

On 22 May 2007 19:59:46 -0700, CB wrote stuff
and I replied:

I have a serious concern about a machine thread in the relatrively
thin wall of an almmunium mast. Al does not takew threads well, and
then not fine threads, adn then most thin metals a happier with
coarser threads.

Aluminum riv-nuts are easily obtained, easily fitted, and reasonably
replaceable when the time comes. Screw a SS screw into a riv-nut

Brian Whatcott Altus OK