I was introduced to the Gnomish Flickmace, in the thread about Brigitte's flail. As Carcer said there, it's listed in the exotic weapons table on d20pfsrd, but there is no description of it. So, why does the Flickmace from GoG not have any description?
@Carcer reports that the actual description for the item was apparently mistakenly cut from Gnomes of Golarion itself. I searched a bit about this and found that it was not a mistake. They just needed space:
The description of teh Flickmace seems to be missing. It sounds like it could be an interesting weapon.
It got cut for space when the body text ran long, but it remains in the table like an evil, gnome ghost. IIRC it was a mace with a built-in spring, allowing you to use an action to change it from a normal mace to a reach weapon.
Thank you @Carcer and @KRyan for your help in the Brigitte thread :)
The actual mechanics for this weapon can be found in the Weapon Master's Handbook as an example of the Weapon Design rules. This book classifies it as belonging to the polearm weapon group, and describes it as a two-handed weapon with the "spring-loaded" ability. The "spring-loaded" feature creates a polearm which can telescope to gain reach, or collapse to attack adjacent squares, both with a swift action.