This route climbs the obvious off width crack to the left of Mainliner. It's not long, but a really fun route. It is possible to set up a top rope/top belay if you sling the big block after topping out.
Since there are no chains or bolts nearby after topping out, the best thing to do if not having someone follow would be to sling the large block, get lowered, retrieve your gear and walk around to the left, scramble up and grab your sling.
Approach as you would for Mainliner and other routes on The Leaning Tower
A selection of #4 and #5 camalots. I put one # 5 in at the start and used a few # 4's the rest of the way, although you could squeeze in another #5 along the route, just don't go so deep.