The clutch adjuster comes out from the inside .. They don't thread thru the clutch cover ,the adjuster just pushes thru the clutch cover and is sealed with an o'ring .. Yours is corroded where it passes thru the cover ,if it won't free up by turning it back & forth then the cover will have to be taken off and the hole & adjuster cleaned up ..
Here is a picture of the adjuster ..
Here is a picture of the adjuster ..
