The famed British rock group the Rolling Stones night as a tune-up tor the group s U.S. concert tour, appeared at Sir Morgan's Cove in Worcester last About 300 fans jammed the club and another 4.000waited outside in the rain for a glimpse of the British Keith Richards, group. From left: Ronnie Wood, Mick Jagger andfj.5By JAMES SIMON * Associated Press WriterWORCESTER (AP) - It was one of the worst-kept secrets of the year as some 4,000 screaming, rain-soaked rock fans massed at a club seating 300 for a free Rolling Stones concert previewing their first American tour in three years.Boy - some secret,” Capt. John Walsh grumbled Monday night as he and about 70 police officers, some in visored riot helmets and carrying batons, maintained order in the pot-smoking, beer-drinking crowd outside Sir Morgan’s Cove, a rock club a block from Worcester center.Police reported 10 arrests, five for disturbing the peace and five for throwing missiles, which witnesses said included beer bottles.However, no injuries were reported.The fans outside, barred from the club, clambered up on friends’ shoulders, climbed to nearby rooftops, scrambled up light poles and pushedconcert1and shoved on the ground to glimpse their idols. The Rolling Stones arrived shortly before midnight for a performance they tried to keep small and secret.The British rock group drove in a white and yellow-striped camper van down an alley behind the club to avoid the crowd, which chanted We want the Stones during a thunderstorm.The concert started about midnight before an audience that had entered the club peacefully more than four hours earlier. The Stones sang for nearly two hours, toweling off after each numberin the overheated club.Tickets to the show had been labeled for Blue Monday and the Cockroaches” in a vain attempt to keep the attraction secret.A busload of police reinforcements showed up about an hour before the band arrived to bring to 70 the number of Worcester police trying to keep order. Green Street in front of the club was closedto traffic.Some witnesses reported flares were lit qjid bottles were thrown outside the night spot.There was no publicity for the concert until Worcester radio station WAAF-FM announced Monday it would give away 300 tickets that day to fans wearing a station T-shirt or carrying a station bumper sticker on their car.1 stuck one to me. I stuck one to my car. I stuck one everywhere.” said Lynn Braconnier, 19, a Worcester woman, one of the lucky ones to receive tickets. She called the concert the biggest thing that ever hit Worcester.The Rolling Stones want this only for the kids on the street who support them,” said Joseph Faucher, the club owner. They do not want the press inside. They have specifically said they do not want writers inside.”WAAF-FM refused to announce the location of the show, station program director Dave Bernstein said.It’s just a chance for the Rolling Stones tohave their fun, play the kind of music they want to in a small club atmosphere with no press allowed in,” said Bernstein.However, Boston rock station WBCN-FMobtained the name of the club from a Worcester police officer, according to WBCN reporter Matt Schaeffer. Police said a crowd started to form outside the club after the location wasannounced.The Stones have practiced for several weeks at Long View Farm, a recording studio in North Brookfield, to prepare for the tour to promotetheir Tatoo You” album.They open the tour Sept. 25 at Philadelphia’s John F. Kennedy Stadium, which holds more than 100,000.Under the WAAF plan, the names of the tick-et-holders were written down, and they had to present a photo ID at the door with the ticket to get in.