So a couple of weeks ago I decided I needed to do this as left head slightly scraped over printing parts. Read first posts and it seemed simple enough should have read more of thread before starting! Took fans off and no set screws, then read enough more to know they are on the back(PowerSpec Pro), so ok take it apart. Thought why not turn so screws are on front so swapped heads which of course does not work because of offset, but now can't swap back because they are now frozen in place. Tried pulling, prying, and taping for a couple of hours scratching everything pretty good and no movement, so thinking I'm screwed. Last resort before ordering new parts tried spray lube and managed to wiggle them out. Had I carefully read the whole thread it would have saved me a lot of grief.

Got everything back together and it was the same still off just a little so had to take apart and redo with calipers handy. So now I have ordered the part jfkansas designed, looks like it will make things a lot easier.