I re-read a previous post of mine and found an error.
I refered to the 'shop head' of the rivet when actually it should read
'factory head'. The 'factory head' has a small dimple that
centers your drill on the rivet while you are drilling the head off.
More care would be needed to drill the shop head off since it does not
have a center dimple.
The shop head is the side that was deformed when the rivet was
originally set.
At any rate the Zenith Builders and Flyers site blog
http://www.zenith.aero/profiles/blogs/part-3-installing-the-upgrade
Part 3: Installing the "Upgrade Package" to our Zodiac CH 601 XL:
Drilling out the top inboard main wing spar
has the solid rivet removal technique covered in detail.
PS In keeping with good journalistic procedures, notice my retractions
are published weeks later,
in smaller type, on the back pages and after it doesn't matter any more.
Gary Ray Working on the Zenith upgrade
----- Original Message -----
From: Gary Ray
To: zenith-list@matronics.com
Sent: Tuesday, November 10, 2009 5:32 PM
Subject: Re: Zenith liability
A Technique for removing the solid rivets:
The spar cap solid rivets can be drilled just far enough to almost
remove the shop head then a light tap from the side with a chisel
removes the rest of the shop head, the rivet body is then lightly
driven out of the hole with a smaller drift punch without any chance of
damaging the holes. It all went very well. I did find a mass against
the opposite side from the drift punch helped a lot just don't damage
your spar caps with this mass.
Gary Ray
