When tightening a c'sunk bolt in (comparatively much weaker) plastic,
the taper on the head acts like a wedge in the hole and can split out
the plastic (a radial crack from the hole to the edge) if
over-tightened.

You can certainly use c'sunk bolts; just don't over tighten them.  I
think they are much cleaner looking than raised heads.

Tod
M17 #408
BuscaBrisas

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
] On Behalf Of David W. Wood
Sent: Sunday, April 23, 2006 9:08 AM
To: [email protected]
Subject: M_Boats: Replacing M15 windows


> The screw holes are countersunk but everything I've read says not
> to do
> that. What do you think?

First I've heard of that. Does anything you've read tell you why not  
to countersink them?

David

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
David W. Wood   -=-  [EMAIL PROTECTED]
1981 M15   -=-  Hull #163


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