Still searching for ther elusive Lefty Oliver 100hr service instructions.
Best I've managed to find so far is this for the Lefty 2.0. Need to sit down with the various exploded parts views and see what is what with a cuppa or two (maybe during one of the more boring Vuelta stages coming up).
Looks like it only requires one special tool - the KH198 Slider Tool (apparently, the KH123 is also compatible) as long as you have a 36mm socket (which I think I do (or you can buy the KH127 which is a pretty green colour).
I actually don't know yet what the local cost is to get it done, but it looks like A$300-ish
EDIT : Ooh, Ooh Just dug a bit more in the Vimeo link (and found all of these - there is 5 pages -Cannondale Tech Clinics ) and then the HOLY GRAIL
2016/17 Left Oliver 100hr service (or annual)
Going through thge video, the KH200 Slider tool (vs KH198 for the Lefty 2.0) is required. Need std 36 & 24mm sockets as well. Need a KH240 to undo the cyclinder, but can also clamp carefully in a vice (there are 3 bike size specific air cyclinders ?? - need to read and understand more), a HDTL187 to clamp the shaft ...
So, needs a few speccy tools, but seems eminently doable