After the Boulder, head south along the quarry floor. Keep away from the bottom of the main climbing areas in case of falling rocks.
Red Wall (see the EC) is off to the right in the trees, half way to the Shelter Stone. At the Stone bare right'ish into Lime Works Wood, which forms the long leg of the 'T' shaped site. Head for the south side and a very straight path, built on a small embankment to keep it flat.
This is the remains of the incline, a narrow gauge 'railway' on which trucks took the quarried stone down to the lime works and the railway at the bottom of the site. The laden wagons were connected by a continuous chain to the empty ones, which were pulled back up by the weight of the full ones. As you walk down the straight path, look for the remains of the wooden rail sleepers on the incline.
Occasionally, the chain would break and trucks would run out of control and overturn, spilling their load. A few mounds of spilt limestone can be seen on the side of the inclines. At one of these is the cache site. The trees may not help the GPS signal!
The cache is in a coppiced sycamore, which looks exactly like a hazel, except for the leaves, which obviously aren't there all year! Good luck!
Onward to The Works