In reply to swmackey:
I'm sorry to say but you're very much mistaken re. the walk-in.
I presume you're intending to do Will o' the Wisp. Craig Cywarch is a huge cliff but the climb is on Tap y Graig buttress, the obvious clean triangular buttress which is easily seen as it's directly above the car park. The approach past Blaen Cywarch farm is slightly circuitous but shouldn't take more than 30 mins - although the point where you leave the horizontal(ish) traverse path directly above the conifer plantation to ascend to the base of the buttress can be missed if it's obscured by bracken. If you go too far then you'll just have to make a more direct approach for the final 5-10 mins.
Detailed approach notes can be found in the CC Meirionnydd guide.
Post edited at 14:40