Old power supply does not fit new MBP

I recently got a new MBP to replace a 2011 unit that went bad.  The wife also have a 2007 MBP.  Over the years I have accumulated four 85 watt power supplies with the magnetic catch.  Magsafe I believe they call it.
I keep one on my desk at the office and one on the desk at my home.  I don't even have to take the new one out of the bag.
Imagine my surprise when I tried to attach one of the old power supplies to my new 2014 MBP.  It didn't fit.  The new computer is thinner than the old ones and the mag connector is not as wide (or tall if you consider the angle it sits at).
After pondering the situation for a while and staring at the connectors, it dawned on me that the electrical connections and local area around them are identical.  What is different is the thickness of the surrounding metal rim.
I took one of the old power supplies along with the new one out to my shop and milled .028" (28 thousandths, or 28 mils) off each side of the old connector.  Voilá, it worked perfectly.  The two modified units now are back in place on the two desks and my new power supply is safely tucked in my carrying bag for use when I am "out".

Should the trip to the shop prove to be tiring, you may get one of these instead:
http://store.apple.com/us/product/MD504ZM/A/magsafe-to-magsafe-2-converter
Ciao.

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