Reply To: My first practice piece!–updates

[Bob Tascione]

Hi Peggy,
I think you may be referring to the mainspring stop pins (I can’t remember…What the heck is the official name for these pins? Anyone?). As open mainsprings unwind they can expand into the movement and interfere with wheels, wheel arbors,levers etc. These pins direct a springs expansion toward the outside of the movement preventing contact with critical parts. They also protect a movement from possible damage from sudden spring breakage.
When you place the springs back into the movement be sure that none of the coils are sitting on the wrong side of these pins.
Hope this helps Peggy,
Bob