bathroom knob defect replacement

"I want you to replace the bathroom knob."

I used to cheat and use it until now, but it seems that I finally decided to exchange it.It doesn't lock and the knob doesn't turn.

The latch bolt is also stuck.I started removing it, but I couldn't remove the knob.

I decided to cut with a grinder so that no cuts would remain in the bathroom.However, it was not possible to cut it completely with a grinder, and it was possible to cut up to two-thirds, and then pry it off.

I don't know how many years have passed since this rust on stainless steel.

It is finished after exchanging with GOAL's cylindrical lock.