Pitlock security fasteners : CTC Cycle Magazine Review April 03
"This complete line of security fasteners, for all the most precious and pilfer-prone parts of your bike, is newly imported by Orbit Gearshift, but has a well-proven continental pedigree, being especially popular in its country of origin: Germany. The fittings are all stainless steel and work via a funny-shaped threaded cam recessed into the outer cap - a lock in a pit, if you like. All the parts are exquisitely made and that cam comes in 256 different shapes. You cannot turn it except with its dedicated key: which has a 15mm hexagon-head and a hole through the side. So you can turn with a 15mm spanner, use an allen wrench as a tommy bar, and thread it on your key-ring. Several different sets are offered, some including fittings to secure threadless headsets (otherwise anyone armed with an allen key can steal your expensive suspension forks) and even brakes. The one illustrated just deals with the easily and often nicked wheels and seatpost. Note the slight bend on the seatpost skewer. That's as straight as I could get it after fitting to a seatclamp with angled faces, on which it became very difficult to turn and insert the key, due to the tilted cap. Make sure that your seat-clamp has parallel ends."
Chris Juden