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I have two deadbolts on my front door, one of which is a surface-mount Segal double-cylinder lock. I’d like to change the keys following construction and I’m wondering how difficult it is to replace the cylinders, whether replacement cylinders are readily available from Segal, and how difficult of a job this is. Since the lock is already installed it seems like it’s a matter of taking out some screws, popping out the old cylinders, and replacing the screws but I haven’t done this before. Also, I’m not finding a lot of Segal replacement cylinders online, which may be due to the company being acquired and products being made under license by another company. Can I use other brand cylinders? Anyone familiar with security pros/cons of surface mounted vs. mortise deadbolts? Also, are double cylinders sold as a unit or do I just buy two singles? Thanks.