Re: Im stuck!
The arm will need a slight 'Z' bend put in it to clear the sprocket/bolt heads. It should go right back where it was with just a little offset which the clamp that held it should allow. If the arm was attached with a screw to a welded bracket on the frame, very rare, then a little adjusting there might be necessary.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"