[Public-List] Main Sail Track Fasetening

Roger L. Kingsland r.kingsland at ksba.com
Mon Oct 19 13:59:16 PDT 2009


I uses 1/4" SS rivets to fasten hull to deck and agree w/ you about the
difficulty.  I broke 2 rivet guns but my handshake is allot firmer now.  If
I did it again I would try a pneumatic rivet gun like this one
http://www.nextag.com/Campbell-Hausfeld-PL1539-Air-66267316/prices-html for
$70 +S&H.  I also found this attachment to a cordless drill that looks
pretty nice but costs $142 w/ S&H

Seems it would be allot easier than screws and worrying about getting every
one properly threaded.

Gord - I got screwed by a guy named Robertson once but I didn't know he
actually made screws.  

>From the trusty internet (may even be true).
Robertson Screw
In 1908, square-drive screws were invented by Canadian P. L. Robertson.
Twenty-eight years before Henry Phillips patented his Phillips head screws,
which are also square-drive screws. The Robertson screw is considered the
"first recess-drive type fastener practical for production usage." The
design became a North American standard, as published in the sixth edition
of Industrial Fasteners Institute Metric and Inch Standards. A square-drive
head on a screw can be better than a slot head because the screwdriver will
not slip out of the screw's head during installation. The Model T car made
by the Ford Motor Company (one of Robertson's first customers) used over
seven hundred Robertson screws.  

Roger 148

Roger Kingsland, Managing Partner
Kingsland Scott Bauer Associates



3441 Butler Street
Pittsburgh, PA 15201
N 40° 27.8344'  W79° 57.9831'
412-252-1500 ext.101 
412-779-5101 cell 
412-252-1510 fax
r.kingsland at ksba.com

-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of Michael Taylor
Sent: Monday, October 19, 2009 4:10 PM
To: public-list at lists.alberg30.org
Subject: [Public-List] Main Sail Track Fasetening

After painting the mast I am putting the main sail track back onto the
mast.  I see that some have tapped each of the existing holes to replace the
rivets with machine screws.    The track is stainless 7/8" with 3/16th holes
drilled.  The next drill size up will just clean out the existing mast holes
and leave sufficient room to thread either 1/4 inch or 6mm machine screws.

Having got a sample of machine screws with various heads it seems that the
heads are too big for the existing sail track (they don't seat at the base
of the track).  I assume that the only way to use machine screws is to
either change the sail track or drill new holes which I'm not prepared to

If I can't use machine screws it will be back to aluminum rivets with a
steel mandrel as I've found strainless very difficult to remove - and

Have I missed something with machine screw fitting here?




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