Since I last wrote about gutters ("Refurbishing Wood Gutters," JLC, 9/88) a few readers have written to me about their experiences with unusual gutters. Curved Wood Gutter Steven K. Riemer from Boston writes: "This English Tudor house has a curved wood gutter that surrounds the turret. It is deteriorated and needs to be replaced. The replacement would have to match up with the connecting straight gutters. 'Normal' gutter companies are not equipped to handle this. It is obvious that considerable skill is needed to replace a curved gutter." Welcome to the field of house restoration where the "abnormal" is commonplace. I've never had to work on a curved gutter, so I contacted Ed Turbak at Center Lumber (85 Fulton St., Paterson,