Hi Roger,
Based on your original post, that is the area where I was looking. Having read some of the later posts, I am surprised that I missed something 30 mm in diameter.
I asked about what the capacitor rests in because there is a black plastic piece mounted near the "Ducatti" box above my battery that is about 1-2 inches square with a bunch of what look like electrical pin connection holes on the top. But, there are no wires in any of the connection holes. There are wires running into the bottom of the piece. Also, the bottom of the black plastic piece looks like it should surround round (not square) tube. But, it is not attached to a tube which seemed strange.
My plane is a very early 2005 unit. There is another CTSW nearby that is also an early 2005. The other owner and myself have noticed a number of minor differences between our planes even though they only differ by three in serial number. So, I wouldn't be surprised if what I am looking for is not exactly where it is found on most later CTSW /CTLS models. Also, my plane was used by flight school before I bought it. So, there was plenty of opportunity for the capacitor to "disappear".
Again, my apology for not thinking of taking a picture when I had the cowl off. Thanks again for the help!
--Mark