كيف يمكن توسيع ترس ترس المدفع لتقليل الاحتكاك؟
A little known technique that works great is: With the cannon pinion installed on the watch, use a pair of fine cutting pliers and squeeze the cannon pinion right in the original dent that creates the friction. It actually counterintuitively reduces the friction. Just a little squeeze goes a long way.
You can also broach it, as Klassiker says, but this becomes difficult to next to impossible on closed cannon pinions (most watches without center seconds).