how to hold down 29 ford hood

I am not to the hood stage on my '29 roadster but I have similar questions. You mean you took apart a four piece hood? Try Rootlieb hoods, from what I can see you buy a narrow piece that attaches between the cowl and the radiator at about the place where the hinge was for the four piece hood. They are widely advertised in Street Rodder and other rod magazines. Unless the fourpiece hood was really beat up it might have been easier to buy a single plastic or aluminum single piece that fastens on the sides to the same type bars which are about one inch wide. If you keep the center hinge and have trimmed off the side hinges you may be able to pop rivit "lunch pail latches" available from most hardware stores and use them to attach to home made flat bars attached between the cowl and the radiator. This should also add strength to the radiator. Of course today you can buy almost anything that has ever been imagined, but maybe you can fashion your own side bars out of thin flat steel and use pop rivits at the ends with two or maybe three lunch pail latches along the edge. Another very old trick that some people liked was to attach two leather belt straps over the top of the hood, but I don't think that would look good since the side spaces are large.
Where are you, I need a buddy with a '29 to compare notes first hand. I am in Central Virginia USA.

I edit to agree with Streets below, Dzus fasteners lie flat and I believe they are spring loaded to remain tight when turned.

Don Shillady
Retired Scientist/teen rodder