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
I saw them on several industrial furniture web sites but I recall that my uw photo shop has different brands and they are slightly different.
For scooter use, sad news I have to check for some feedback on some technical dive forum...
I'm tempted to try again to adapt Gorillapod for use as light arms, but I've read that the aluminium one snaps after a while in seawater use, and non-umbilical lights have nothing to save them from the abyss. I've also read that more recent plastic Gorillapod doesn't go floppy like my old one, so that might be an option. Making connectors for the ends is the difficult part.
Nick, why you want to adapt Gorillapod and not use simple locline parts? Are they different?