I know there is sinew on the lower front legs of deer and I have been saving that. Where else can I harvest sinew on a deer?

The silver skin I've skinned off backstraps is pretty sinewy, don't know how it compares, but I've peeled off fibers and wrapped stuff and it works ok....

Yup, long strands off the backstrap.

I save the stuff off the backstrap, too. I always make sure I remove the meat and fat that may be left on it. Usually a quick scrape with a spoon will do it.

Moosetrot

If you know anyone butchering a beef, get those leg tendons from the beef! Elk and moose have great tendons also.