We were taught to cuff with key hole down with the fixed.
If done right, you place your cuffs in their pouch/holder the right way so that when you pull them out with one hand, they just go straight on the correct way.
The logic I was told to cuffing that way (key hole down) was that it didn't matter so much when you put them on, but when they came off, it meant that the crook had to bend over forward a long way for you to get them off easily. This meant that they were in a very weak stance while you were taking the cuffs off.
If it was a totally compliant cuff and I expected absolutely no probs, then I might put them on the other way so they were easier to get off, but that was very rare. In fact I can only recall one offender I did that for. Also by varying your style you affect your muscle memory and usual technique. Best to practice a certain way to the point that you can do it blindfolded.
Also our hinged cuffs had a small hole to push in to double lock them. They cuff key had a small spike on the back of it that was desgned to be used for this purpose. I never used it. I always pulled out a pen and stuck that in there. If the crook decides to resist at that moment, I am not dropping my cuff key, but a 50 cent pen instead (that the dept paid for). A lot easier to find if dropped, and a lot easier to replace if not found.
"He didn't want to tell the cop he was on his way to the Butt Pirate Palace for a little two-step with Joe-Joe during the Village People marathon." - Cat_Doc
"Cause when your hourglass runs out of sand
You can't flip it over and start again...Don't blink..." Kenny Chesney
"Take care, never leave home on bad terms, watch your back and go home in one piece." - Aussie Nathan
"The batton in my jacket is hot like a porn actor to beat someone down." - Patchcop