Surprise Piece
The four-armed piece secured to the quarter snail which is free to move within certain limits, and prevents the rack from reaching the snail. See Repairing Repeating Watches.
How to true a balance, repair a chipped dial, temper a spring or test a stone — the working bench-book of the American watch trade, arranged A to Z.
The four-armed piece secured to the quarter snail which is free to move within certain limits, and prevents the rack from reaching the snail. See Repairing Repeating Watches.