Russell Duffy wrote:

> I'm now wondering if I couldn't just put about a dozen 1/8" pop
> rivets, rather than welding the angle.  I have to admit, that I'm
> thinking about easy of replacement if one ever gets damaged away from
> home.  Assuming I keep a spare core with two AN12 fittings welded to
> it, all I'd have to do to replace a core is drill out the
> rivets, then drill and pop rivet the new core.

That's the way I did it (but also JB-Weld inbetween the angles and the
cores - probably not needed). Well, actually I do have two 1/4 threaded
rods on the outside of the cores connecting the upper and lower angles.
However, both Tracy and Ed have rubber spacing  - basically clamping the
cores between their mounts.
Tracy's comment was that my installation would never make it in a
Lycoming environment (vibrations).
I never fully understood that - if cores are solidly mounted to the
engine there should be no realtive motion...

Finn