This is my first attempt at reporting a MYOG item. Sorry for the crappy photos, but I think they'll work OK. This MYOG is reported to honor Roger Caffin, another SP stove lover. He'll absolutely cringe when he sees what I've done here.
Here's a photo of the setup, with a SP 600 pot in place.
First off, if there's no wind, there's no need for this stove screen. But as a breeze kicks up, any stove's efficiency drops off dramatically. With this screen setup, I've been able to protect the stove flame from the wind, while allowing sufficient flow of air to the burner. The key element is to protect the stove burner from underneath, in addition to the screen that surrounds the sides of the pot. The two screen components are shown below.
Screen assembly mounted on stove:
Top view. Note the minimal, but adequate ventilation from underneath. The bottom disk rests at the base of the burner head, 2" above the canister, held in place by the slots that engage the stove pot support arms.
The side screen is fastened together by means of a titanium rod that connects the ends of the screen together. Hopefully this photo shows that well enough. When disassembled, the screen and bottom piece slide nicely into the SP 600, leaving plenty of room for the stove and other small widgets.
DANGER! UNDER NO CIRCUMSTANCE WILL THE USER ALLOW THE CANISTER TO BECOME HOT TO THE TOUCH! (If you do, and live, Roger C. will thump you hard).
I keep the canister well below even a warmish temperature, by only using the most minimal flame setting on the stove. Just a little bit higher than the setting at which the stove will not continue to stay lit. In the case of the SP Giga stove, this is about 1/8th of a turn of the control knob from the OFF position. If I turn the knob even a half turn, the canister will begin to warm up appreciably. I monitor the canister constantly, to assure that there aren't any variances in the flame output.
In the event that I run out of canister fuel, the screen will function with other fuels. In the photo below, you will see a pair of titanium rods that have been inserted into the holes on the screen to act as a pot support. While the holes don't happen to be located at the optimal height for using an Esbit tab, it still works OK in a pinch. Next to the screen is a support triangle that works quite well for both Esbit and a wedding tin stove.
OK, so here comes the fun part--the increase in the stove's efficiency by employing this screen arrangement. I waited for a moderately breezy night to do my testing. Nothing too serious, maybe 5-15 MPH. Using a new canister, 2 cups of 45*F water repeatedly consumed 0.20 oz. of fuel. I then did a few 2 cup boils using a 5-year old Jet Boil stove at its lowest functional setting (maybe 1/8th of a turn from the OFF position). Each of the Jet Boil runs consumed .25 oz. of fuel. So, while the Jet Boil reached boiling much, much faster than my SP setup (4-5 minutes vs. 7-9 minutes) the Jet Boil actually used more fuel to reach boiling. By the way, I tested the SP stove without using the screen, and 2 different boils each consumed 0.4 oz. in those breezes. So the screen works. My Jet Boil setup, minus fuel, weighs 15.0 oz. The SP stove/pot/lid/screen arrangement is 7.9 oz. So, for me, saving 7 oz. and 0.05 oz./burn, as well as having a much more wind-resistant stove, makes me a very happy guy (not that I'd consider hauling a Jet Boil in the first place!).