I did the entry & exit for this canyon a little different than what Todd suggests in the book and I think I prefer my way!
I got my car almost to the FR142 & FR142B (Calloway) junction and we road walked up 142B a mile or so before heading west to the eastern rim of upper X-Pine and followed that another half mile before finding an easy slope to drop into the middle part of the canyon. We hit a few extra down climbs and setup an additional rappel that aren't in Todd's beta, but it just added more to the adventure.
I hadn't heard too many great reviews of this canyon, so I really wasn't expecting too much though I found this canyon's narrows to be pretty sweet!
The narrows start off with brushy 40ft rappel down to a pool & ledge of the dryfalls with a bolt to perform another 50ft rappel. Here we put on our wetsuits and did another 50ft drop with a very cold swimmer below and further downstream hit another 35ft rap just before hitting the WCC. Once at the beautiful WCC, we stopped for a snack break and warmed up in the glowing sun.
Once we were rested up, we rock hopped/bushwhacked/waded/swam upstream the amazing WCC about 1.5 miles to the Calloway trail and dropped our wetsuits for the steep climb back up to the rim. Once up on top, it was just a relatively easy 2.5 mile road walk back to our parking spot.
So I did the loop different than Todd's book but this way involved less road walking for us 2wd drivers and the extra bolt meant we only needed one 200ft rope.