I have used these handles when I don't have any handles or all I have are slots- Just cut the hole to fit , mount them and "ta-da" Easy to hold handles that retract.

Cost- $12.70 for a pair. Holds 75lbs per handle.
Site http://www.hammondmfg.com/handl_fold.htm

http://home.comcast.net/~tdicaprio/images/P-Handle.jpg