I'm renting a flat and want to change the lock cylinder because it doesn't have a thumb turn and I caught someone trying to break in before. After some research, I ordered a Yale platinum thumb turn cylinder. The new cylinder arrived today and I realised my cylinder is an oval cylinder, not a euro cylinder Should I look for an oval cylinder with a thumb turn, I've not come across any that look decent. Or, I can convert the oval to a euro cylinder. I don't know if I should give up and buy a cheap oval cylinder or try to convert to the euro cylinder I have.