I was up there last June with my son, after a 43 year hiatus. I bet a few climbers here realize that the original way of doing this pitch is to drop down from the end of the ledge, and continue up a short inside corner to the belay, rather than go up that awkward, squeeze chimney, which I thought was a bit---ch.
I recall there is a very convenient rail on the face below, right at the narrow point
I walked it until it got a little dicey, reached down to the crack behind, lobed off and hand traversed a few meters and mantled back up. Didn't seem (at the time) like that big a deal, 5.7 hand traverse for 15 or so feet with primo protection.
The moves getting into the chimney and subsequent rope drag at the top seemed a lot more daunting!
What trundlebum said. I walked, I crawled, I hand-traversed, mantled, thrutched and belayed. I was soooo stoked, especially since it wasn't my lead, but my partner was too spooked, so I got the glory. So glorious it is, too.