Cees,

now that's what would, on that side of the pond, be referred to as "splitting hairs" - control, adjustment... a matter of semantics . They both mean the same thing in this context .

I never used them (although I have it on an identical Webra w/ Dynamix carb) but it strikes me as though you would want to set the "max lean" point to still be a tad rich when run static. Once in the air, unloaded, the engine picks up a few RPM's leaning out the mixture. The adjustment then allows you to richen slightly to prevent over-revving. Dunno, it strikes me as important to be able to get the engine on the pipe when static and not figure it out in the air.

David.