I very easily converted my Merkur 11C into a Bulldog. Well not really but it sure looks like a Bulldog. I simply removed the knob by pulling it straight out. Similar to replacing the plastic knob on a Progress. Then I removed the split ring washer which is simple. The shave is not any different just having a little fun. I am planning on leaving it that way. I saved the split ring in case I want to convert it back.