Mate you need to be more specific about your question. Is it 5/6 digit? The model is super important as the tools used for the task is different.
Rolex changed their brushing type and technique. Sub-c clasp for example has graining effect (or call it micro scratches whatever you choose) which can be achieved with rubber wheels (some call them stone wheels) and can not be achieved using bergeon or any other brands woven or unwoven type of wheels, pads sandpapers etc..
3M Sandpaper Pad
Green Scotch Brite Pad.
This is the homemade way. The gen-like brushing consists of multiple variations/combinations of Bergeron polishing wheels designed for Rolex, adding a "white" look on the steel.
Bergeon does not produce those wheels mate, just like they don't produce most likely half of their products in house. I lived in Switzerland for 5 years, can testify for cost of living, manufacturing and salaries. if they would produce every single item on their catalog ue and wouldn't rebrand them you would pay x3 times for each item due to labor, manufacturig etc costs..
For example bergeon one dip is a sticker product, the rubber silicon bergeon wheels are rebranded artifex wheels list goes on..