Almost sounds like you didn't put the knife in, or had it in backwards. If you cut the pieces up that small and it still didn't feed something was pretty wrong.
Sometimes, with very sinewy meat, a tangle of sinews can block the flow and you just have to clear it out and keep going.
I have used a kitchen aid grinder attachment with good results. I bought be a 1hp grinder from Cabelas, though, and you practically just drop the animal in live with that sucker.
Honestly, though, a good hand-crank grinder should do the trick just fine if you're ok with the effort.
It's a lot easier for the government to turn honest citizens into criminals than criminals into honest citizens.