I respectfully suggest to Fixer, Harry, et al, that this system could possibly be modified to avoid making rookie mistakes involving twin red
No one's immune from confusion. Once upon a time (signifying a fairy tale, even if true) I had a work order to rebuild a Yamaha Enduro engine. I took the engine off the shelf and stripped it down to the crankshaft assembly. Everything looked good, down to new gaskets and clean oil, brand new in fact, so I asked the Service Manager what was up. That's when I found that the next guy down the bench had rebuilt it earlier that day and I had grabbed the wrong one.
Oops. Happens to all of us.