accessor bases having on confronting portions thereof respective overlapping edges which can overlap each other in a direction normal to the longitudinal direction of the guide rails.
Each of the accessor bases may has a pair of first rollers held in rolling engagement with one of the guide rails, and a second roller held in rolling engagement with the other of the guide rails.
Each of the accessor bases may be substantially of a triangular shaving having a first side extending along the guide rails, a second side having an end joined to an end of the first side substantially perpendicularly to the first side, and a third side interconnecting other ends of the first and second sides, the overlapping edges comprising the respective third sides confronting each other whenZachary Good, clarinetPittsburgh native Zachary Good earned his Bachelor of Music degree at the Oberlin Conservatory. He began clarinet lessons with Eric Nelson, performed in many ensembles while at Oberlin, and will play this summer with the Aspen Music Festival's Contemporary Music Ensemble. Next year, he will study for a master's degree with former Chicago Symphony principal clarinetist Larry Combs.06/08/2013Time: 7:00 pm

Playground ProjectPart of the upcoming 2013 Carnegie International, The Playground Project is a richly-illustrated exhibition exploring postwar playground designs from 1940 to 1980. Examples from Europe, the US, and Japan are seen in more than 130 photographs, prints, plans, models, books, films, and slideshows.06/10/2013 - 08/11/20134400 Forbes Ave., Pittsburgh, PAwebsite | map

Seven Brides for Seven BrothersMilly didn't know life with Adam would include six rowdy brothers-in-law as