Ned Simmons wrote:
On Thu, 16 Jul 2009 14:18:39 -0500, cavelamb
wrote:

I'm trying to remove a hatch to replace the acrylic cover.

Stainless steel screws through aluminum frame - 18 years old.


The manual impact drivers like those at the bottom of this page were
the preferred method for removing stainless screws from aluminum spars
when I was working in boatyards 30+ years ago. Almost always works if
the screw head hasn't been buggered before applying the impact tool.
You may have to support the hatch below the fastener you're working on
to get the full benefit of the hammer blows.
http://www.mcmaster.com/ctlg/DisplCt...tlgEdition=115

If you buy one, get a few extra bits as well. The Phillips bits are
pretty sturdy, but the smaller slotted bits can break.



I considered that approach, Ned, but didn't try it because high impact
force can cause fiberglass to delaminate.

Even if it could be supported solidly, a heavy handed hammer could crush fibers.

But thanks for the suggestion.

R