Doc Barr was the pioneer on this, Stoddard and Steinberg continued his experiments. While Stoddard’s instructions state that the composition must be slightly damp to chuff, I’ve found that it will chuff even when dried thoroughly – the Naphtha seems to make it chuff. If no Naphtha is used, it seems to chuff much less. I used a standard BP rocket spindle for these and fused them with fast Visco that had the tip dipped in NC lacquer and a bit of titanium. The reason for the hot fuse is that normal Visco (especially American) will not ignite the core reliably. Another alternative is to press about 1/3 increment of whistle just above the nozzle. That always ignites them. The composition was pressed to about 3500 on the mix. It is important to use the same size magnalium each time. Different sizes affect both power and chuffing.
I used mineral oil instead of Vaseline.
Note: The Ingredients Percentage is higher than 100