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Imagine learning to the play the tuba after training on the violin.   “It’s something like that,” Ryan Tucker laughed.   Tucker has been the Browns’ starting right tackle since 2002, but his four-game suspension for steroid use forced the Browns to move Kevin Shaffer to right tackle and groom Kelly Butler as the backup — at least until Tucker returns.   If Shaffer comes back from a concussion and plays well, or if Butler starts the early part of the season and surprises, Tucker could wind up as a left or right guard or even a center — if the Browns keep him.   Tucker assumes nothing, but indications are he’ll be retained.   Expect Tucker to play plenty tonight, giving him his last feel for the game before he leaves Berea for almost a month — and resting others who will play Sept. 9 against the Steelers.   Don’t be surprised to see Tucker become a swing man deluxe, an ideal insurance policy at left guard, center, right guard or right tackle.   Left tackle? He can do that, too, but Joe Thomas, Eric Steinbach and Shaffer are the top three options there.   “My balance just isn’t all there yet. But it’s fun. I’m having a blast,” Tucker said.   “Right tackle’s all natural. Right guard? As far as I’m on the right side, I’m fine. When they move me to the left, everything is switched.   “My balance just isn’t all there yet. I try not to worry about the footwork too much there. I come off the ball, just go, then hope everything comes into place.”   Tucker, 32, has played 10 NFL seasons. He understands his steroid use tarnishes his image but still wants to be — and seems to regarded as — a leader.     BROWNS AT BEARS   Kickoff: 8 tonight, Soldier Field, capacity 61,500.   TV: WKYC, Channel 3 with Jim Donovan, Bernie Kosar.   Radio: WHBC-FM 94.1, WONE-FM 97.5, WMMS-FM 100.7 with Mike Snyder, Doug Dieken.   Preseason records: Bears 3-0, Browns 2-1.   Sept. 9 openers: Steelers at Browns, Bears at Chargers.   Bear trouble: Star linebacker Lance Briggs has had a psychotic offseason, getting surly amid a contract holdout and lying to police after wrecking his Lamborghini on Tuesday. Kick return whiz Devin Hester suffered a shoulder injury Saturday against the 49ers.   Throw the rock: Rex Grossman (30-of-41, 320 yards) and Brian Griese (19-of-24 213) both present a good challenge for Browns DBs. Grossman is trying to get on the good side of Bears fans, who love the defense and sometimes hate the quarterback.   Something to prove: Brandon Rideau, who spent time with the Browns, leads the Bears with 17.4 yards per catch. Bernard Berrian is at 17.3. The Bears are riding 2005 first-round pick Cedric Benson  at running back with Thomas Jones (1,210 rushing yards in ’06) gone to the Jets.   Rookie watch: The game features two former Miami (Fla.) tight ends, Kellen Winslow Jr. and Bears Round 1 pick Greg Olsen. Little Garrett Wolfe, who ran wild against Ohio State last year, was Chicago’s Round 3 pick.