Trolling Deep without a downrigger?

If I wanted to fish for Kokanee, how can I troll deep without a downrigger? 

thanks

Lead core line or Trout sinker releases with 4 to 8 oz balls.

I use a Deep Six planer.

http://www.luhrjensen.com/prod_lure_select.cfm?Stock=5520&CategoryID=20&ProductNo=5520-000-0091

hitdog, you can buy a seps downrigger release for 8 bucks.

then use one rod with a 1lb weight and the release as your downrigger.

let out ffifteen to thirty feet of line on your light line rod, clip the line to the release,
toss the ball overboard and you are downrigging. you can use an external linecounter
on the downrigger rod, the shakespeare models cost $10, or use a cheap line counter
reel like an okuma if you want to control depth precisely. or else just count out 'pulls'
to lower the downrigger ball to the weight you want.

we had a thread about this. ken kickfish uses this for trout and I tested my own variation
and it seems to work. ken has half a rod run across his kayak at his feet. I have a second
rod pointed off the back of my kayak.

the downside is that you can't easily pull up the weight when you get a hit, you have
to fight the fish and not let it get tangled on the downrigger line, but I think this will work
for you in a lake just fine.

have fun.

Thanks a bunch for the information.  This is exactly what I needed.