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Not sure, but I think you will find that Yale make Era's lock cases or vice versa. All the Willenhall manufacturers have slowly been gobbled up by each other over the years and are all either part of Ingersoll Rand or some other global corporation and thus all make for each other nowadays.
"engineers screwdriver into the keyway, turned with an adhustable spanner"
how do you turn a hammer with an adjustable spanner ?
I don't think that was sarcasm, I think he really did mean a screwdriver 😉
Wow look at where this thread has gone!
Just remember what ever lock you have make sure you lock it proper after that have house insurance,alarm and lock your house down by having locks on every room keyed alike for your convenience this would not look out of place with the right door furniture, all this will do is minimise lost and most important do not leave spare keys out put them in a hidden lock box
When I learnt my trade this is what they used to call an engineers screwdriver, (admittedly perhaps with tongue in cheek).
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Basically the flat on the shaft allows you to put an adjustable on it and icnrease the torque dramatically. The principle I was talking about is the blade is hammered into the keyway, and the cylinder is turned by the application of massive torque. Neither subtle or quiet, but there aren't many cylinder locks that will prevent it.