I really like brake calipers that have those flats on the 'spring block', 14mm in this case. A thin wrench (like a cone wrench) can be fitted when the caliper is on the bike - works well to center the caliper on the wheel. In SRs case you need to torque the center bolt head (5mm key) at the same time to prevent changing the tightness on the caliper arms as you center the pads. Without these flats on the spring block it's much more trial and error, or hammer and stick.

As to "just a bit of oil and go ride", I've overhauled numerous calipers, side and center, single and dual and I generally find fine dirt, deformed metal or plastic, even metal burs on the caliper parts. Only disassembly and cleaning then relube will get them right. Easy and well worth the time.