On Thu, 11 Dec 2008 18:50:26 -0800 (PST), joost
wrote:

I am investigating the best way to fasten a 4 metre long alu t-track
for my whisker/spi pole to the alu mast.
....
And, how would I go with off-the-shelf T-track which is made for
countersunk heads?

Any thoughts?

Thanks,
Joost.

You might think about riv-nuts. Bigger hole in the mast, but much
more thread, when the riv-nut is pulled in place.

Brian W