I normally use ULCS arms, but i agree with OP that continous positioning of clam arms is annoying.
I used 3/4 Locline arms and i most likely will buy another set for my small Nauticam LX100 rig as i use it mostly
while guiding to document special moments and often i don't have time to position the clamps and bending a locline arm is much quicker.
Also the vantage of Locline arms is that you can bend them around your housing to streamline the rig and that is important as i usually have it tucked under my armpit.
Another vantage is that you quickly can break them apart (and reconnect them) to use the strobe/lamp to illuminate from back or other far positions.
Regarding creak, yes they do creak, some more and some less and there is not very much to do. Silicon or dry Teflon spray may help with creak, but i fear that it will make them floppy.
Keep in mind that Locline elemets can be bought inexpensive as they are basically a rigid hose and often used to feed cooling fluid on milling machines and there are several types of them.
the only parts you need is the adapter to your tray and the adapter to your strobe or video light, more elements can be found in (online) tool shops
Davide DB: i think that Locline arms will bend/turn back on your scooter
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