Use a needle with a gauge greater than 18 and less than 24, depending on the size of the bird legs you're going to inject. I'm in the process of experimenting with some methods that are very new and others that are "old school". I would however use what's easiest for you. I've heard of guys that are using Elmer's Glue and Caulk. Which I'm willing to try. Like I said before, I'm trying to make my birds look the best that they can be, so a slower setting time using caulk etc. is exactly the time I have. I'll give you the report as soon as I start to taxi up the pile of birds that I have ready to wire, now that the duck hunting season is closed. There's pros and cons to everything, but if you want to use what the pros use, try using Master's Blend and/or Fantastic Cast. Whenever you use one of the apoxy type injectable hardeners, you must be ready to position the feet exactly where you want them. I never used anything on my first ducks, and they look fine. You can never prevent some sort of shrinkage though, but I would suggest using something. I have used 37% Formaldehyde, but it is considered a carcinogen, and lachrymator which really burns your Nasal Pharnyx and eyes, so I wouldn't suggest using it. It kind of embalms things rather than drying them out completely. Before I'd tell a newbie to start worrying about the feet, I'd suggest the artificial head first and foremost. Some people may overlook the feet, but typically the viewer is looking at the head and body positioning. Get some good reference pictures from a good magazine such as DU, and use it as a reference during the mounting process, and I can promise you that your bird will look more anatomical than if you used memory alone. The best thing would be to start your mounting process early in the day with no distractions and deadlines, and pay close attention to ALL the details; feet, feather placement, evenness of the bird wings, evenness of the eyes, the fullness of the breast and neck area, a correct coloration of the feet and bill, etc. The whole project starts with a full plumed, super fleshed and degreased, nicely cleaned specimen, and all the pros will tell you that. Good luck, and let us know how it goes! If you have any more questions, feel free to ask, and I'm sure that James or myself would be glad to help.