I have to make a replacement glockenspiel note bar to fill the gap in an instrument where a note has been lost. What happens is that the pin that holds the note in place and on the instrument has pulled out and the note bar has disappeared into the ether.
Almost uniquely, Premier Percussion spent a tiny percentage of the potential profit margin on the glockenspiels that they produced on nails with a twisted shank that hold the note bars in place. This incredible phenomenon meant that the nails were less likely to pull out. It is a shame that they used the cheapest wood available for the frame, otherwise their idea would probably have worked.
Maybe it is extravagant, but personally I just use screws, but then the frames that I make are made of hardwood, typically oak now for aesthetics, but I used to also use hornbeam and ash. Because the oak is a lot harder than the softwoods that are almost universally used in the frames produced by the big manufacturers, even if the holes were pre-drilled using nails would probably split the narrow note rails. If the holes were slightly bigger to prevent splitting, the smooth shank on the nail would be able to go in easier, but it would also pull out easier. Screws on the other hand have the fluting that cuts into the wood, the pilot hole is the size of the shank to prevent splitting and it is strong in the direction it is loaded. Finally I can adjust the height of the screw incredibly accurately on a note by note basis, where as a nail would have to be pressed in to achieve uniform height. All in all, I think it is worth spending the extra 20 pence on screws!