Keefer,
I have had several run ins with this, and have patented a couple of archery related items (I was pretty involved in the archery industry back when I was shooting wheelie bows). I would say, go see a lawyer, or look online and find a "Non Discloser" statement. Most reputable manufacturers will will accept this, and hear you out. They will want to "License" the rights to the Patent, but usually will fund the patent search, and sometimes the draw up and patent process themselves.
Here is a real good tip. Come up with drawings (on a piece of paper, napkin, computer drawing, anything!) and cover as many variations of the thing as you can. Have a notery put their mark on it. Take that, and the original prototype, and any advanced prototypes, and put them in a box. Take it to the post office and mail it to yourself. then hold on to it. Its proof that you had the original idea before taking it to the manufacturer.
Keepa detailed log, even a voice recorded log of any meetings. This will protect you to a minimium.
Let the manufacturer know you have done this. They will bet on the idea that you will not take it to litigation due to cost.
I know its costly, but involve a lawyer as much as possible. Have the lawyer present the Non Discloser Statement at a minimium.
I know this sounds like alot, but that industry is a cut throat one, and the guy most prepared will win.
Get ready for a bumpy ride, but it can pay off.