Here is something I thought I'd share. It's a one page "cheat sheet" for the AeroTech 24/40 and 29/40-120 hobby motor delays. The delays are drawn full scale, so all you have to do is hold the delay grain up to the drawing. You can do a quick check to make sure you have the right length delay, or pick a shorter/longer delay for the motor you're wanting to assemble. For example: You have a G64-4W in your stash, but you need a 10 second delay for the rocket you want to fly. If you have a G33-5J reload that you're willing to break up to fly the rocket....use it's delay in the G64 and you're set with a 10 second delay. Note that the 24/40 and 29/40-120 delays are the same diameter, but different lengths. The 24mm delays will work in the 29mm, but you'll need to have the right delay spacer.