Cam action hold downs, more accurately described as clamps (at least in my opinion) are extremely popular for use in woodworking jigs that are designed to be removed or adjusted quickly and easily. But, they can also be used in other situations that call for tool-less assembly and disassembly.
Now, cam clamps won’t provide the same holding strength as conventional hardware that has been properly tightened, but they’re plenty strong enough for non-critical applications. You can find them in several sizes from many woodworking brands and retailers.
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1/4″-20 Cam Clamps via Amazon
5/16″-18 Cam Clamps via Amazon
Garrick
Lee Valley also carries cam clamps in both 1/4″ and 5/16″. They are not as nice looking as the colouful anodized aluminum ones, but they are more comfortable on the hands and less expensive. $C4.95 and $C5.50.