/usr/share/cairo-dock/plug-ins/clock/themes/default/theme.conf is in cairo-dock-plug-ins-data 3.4.1-0ubuntu7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | [Needle]
# height of the biggest needle, in pixels
height = 4
# horizontal left offset, in pixels.
offset x = 11
|