I use a small socket and put it over the threaded part and pound on it. That way you dont pound it flush with the crank arm. But now that youve done that drill it out. Take a punch tap a starting point on the threaded side centred that way your drill bit will go strait through and not slip off and scrap your crank arm. But if you are updating your cranks than just quik cut it off as showen above. French threading so save anything treaded. And if you up date, the new cranks and shaft will have a ring with the bearings pressed in it I have a peugeot PB9 frame with a updated BB ( any Peugeot gurus out there know if this would be compatable) PM me. Yours for the price of shipping.