Recently I have been inquiring about injectors under another another post, titled "Injectors Blues", where you received some constructive criticism. Maybe a larger thread design would prevent some failures. Making it idiot proof is always a good designing guideline. I think, I want a small workable tip for some of my designs. Is it feasible to have having an electric heating blanket with an outer insulting surface that wouldn't melt? Or possibly a resting holder which is electrically heated that includes multiple tip capacity might be a good alternative. A one-hand-operation on a small injector sounds like the way to go. Possibly the three ring design, if the tube is wide enough to shorten the stroke. The ratcheting one-handed-gun sounds good, but maybe the simpler the better. Would the design work with two color laminates? I would rather choose quality and ease of use, over most everything else. The thicker, beefy'er, heavier and larger the better, over thinner, skiny'er, lighter and smaller. This appears to be the rule for tools, unless special purpose functionality dictate otherwise. But, what do I know? I don't even own an injector. But rest assured, if when I do and there is any possible way to misuse or break it, I will find my way in short order! I believe "Murphy's Law" was written by one of my ancestors. If you need some one to field test it, keep me in mind. By the way, I have health insurance and my own worker's comp! Good Luck.