For years I switched my one and only quick release plate between cameras, each time having to go through my camera bag looking for an Allen key. That was until I found Desmond plates on eBay, available in packs of 10 for $110, shipping included. They're not only cheap but also highly functional!
Since I got a back of 10, I rarely have to loosen a plate and when I finally do, I don't have to look for a tool! You see, Desmond plates have very convenient D-rings so that you can loosen them by hand!
Desmond DP-60 Quick Release Plates - easily the quick tip of the week!